{"slug":"terminalskills-a2a-protocol","name":"a2a-protocol","description":">-","long_description":"---\nname: a2a-protocol\ndescription: >-\n  Builds Agent-to-Agent (A2A) servers and clients following Google's open\n  protocol for agent interoperability. Use when the user wants to create\n  an A2A-compliant agent, build an Agent Card, implement task management,\n  connect agents across frameworks, set up agent discovery, handle streaming\n  responses, implement push notifications, or orchestrate multi-agent\n  workflows. Trigger words: a2a, agent to agent, agent2agent, a2a protocol,\n  a2a server, a2a client, agent card, agent interoperability, agent\n  collaboration, multi-agent, agent discovery, a2a sdk, a2a task.\nlicense: Apache-2.0\ncompatibility: \"Python 3.10+ (a2a-sdk) or Node.js 18+ (@a2a-js/sdk). Go and Java SDKs also available.\"\nmetadata:\n  author: terminal-skills\n  version: \"1.0.0\"\n  category: development\n  tags: [\"a2a\", \"agents\", \"interoperability\", \"protocol\"]\n---\n\n# A2A Protocol\n\n## Overview\n\nImplements the Agent2Agent (A2A) open protocol for communication between AI agents built on different frameworks. A2A enables agents to discover each other via Agent Cards, negotiate interaction modalities, manage collaborative tasks, and exchange data — all without exposing internal state, memory, or tools. Supports JSON-RPC 2.0 over HTTP(S), streaming via SSE, gRPC, and async push notifications.\n\n## Instructions\n\n### 1. Core Concepts\n\n- **A2A Client**: Initiates requests to an A2A Server (on behalf of a user or another agent)\n- **A2A Server (Remote Agent)**: Exposes an A2A-compliant endpoint, processes tasks\n- **Agent Card**: JSON metadata at `/.well-known/agent.json` describing identity, capabilities, skills, endpoint, auth\n- **Task**: Unit of work with lifecycle (submitted → working → input-required → completed/failed/canceled/rejected)\n- **Message**: Communication turn (role: \"user\" or \"agent\") containing Parts (text, file, or JSON)\n- **Artifact**: Output generated by the agent (documents, images, structured data)\n\n### 2. Python SDK Setup\n\n```bash\npip install a2a-sdk              # Core\npip install \"a2a-sdk[http-server]\" # With FastAPI/Starlette\npip install \"a2a-sdk[grpc]\"      # With gRPC\n```\n\n### 3. Building an A2A Server (Python)\n\n```python\nfrom a2a.types import AgentCard, AgentSkill, AgentCapabilities\nfrom a2a.server.agent_execution import AgentExecutor, RequestContext\nfrom a2a.server.events import EventQueue\nfrom a2a.server.apps.starlette import A2AStarletteApplication\nfrom a2a.server.request_handler import DefaultRequestHandler\nfrom a2a.types import Message, TextPart, TaskState, TaskStatus\nimport uvicorn\n\nagent_card = AgentCard(\n    name=\"Research Assistant\",\n    description=\"Searches the web and answers questions with citations.\",\n    url=\"https://research-agent.example.com\",\n    version=\"1.0.0\",\n    capabilities=AgentCapabilities(streaming=True, pushNotifications=True),\n    skills=[AgentSkill(\n        id=\"web-search\", name=\"Web Search\",\n        description=\"Search the web for current information\",\n        tags=[\"search\", \"research\"], examples=[\"Find the latest news about AI regulation\"],\n    )],\n    defaultInputModes=[\"text/plain\"],\n    defaultOutputModes=[\"text/plain\", \"application/json\"],\n)\n\nclass ResearchAgentExecutor(AgentExecutor):\n    async def execute(self, context: RequestContext, event_queue: EventQueue):\n        query = context.get_user_message().parts[0].text\n        await event_queue.enqueue_event(\n            TaskStatus(state=TaskState.working, message=Message(\n                role=\"agent\", parts=[TextPart(text=\"Searching...\")]\n            ))\n        )\n        result = await self._research(query)\n        await event_queue.enqueue_event(\n            TaskStatus(state=TaskState.completed, message=Message(\n                role=\"agent\", parts=[TextPart(text=result)]\n            ))\n        )\n\n    async def cancel(self, context: RequestContext, event_queue: EventQueue):\n        await event_queue.enqueue_event(TaskStatus(state=TaskState.canceled))\n\n    async def _research(self, query: str) -> str:\n        return f\"Research results for: {query}\"\n\n# Start server — Agent Card auto-served at /.well-known/agent.json\nagent_executor = ResearchAgentExecutor()\nrequest_handler = DefaultRequestHandler(agent_executor=agent_executor, task_store=InMemoryTaskStore())\napp = A2AStarletteApplication(agent_card=agent_card, http_handler=request_handler)\nuvicorn.run(app.build(), host=\"0.0.0.0\", port=8000)\n```\n\n### 4. Building an A2A Client (Python)\n\n```python\nfrom a2a.client import A2AClient\nfrom a2a.types import MessageSendParams, SendMessageRequest, Message, TextPart\n\nclient = await A2AClient.get_client_from_agent_card_url(\n    \"https://research-agent.example.com/.well-known/agent.json\"\n)\n\n# Synchronous request\nrequest = SendMessageRequest(params=MessageSendParams(\n    message=Message(role=\"user\", parts=[TextPart(text=\"Latest quantum computing developments?\")])\n))\nresponse = await client.send_message(request)\n\nif hasattr(response, 'status'):\n    print(f\"Task {response.id}: {response.status.state}\")\n    if response.status.message:\n        print(response.status.message.parts[0].text)\n\n# Streaming response\nasync for event in client.send_message_streaming(request):\n    if hasattr(event, 'status') and event.status.message:\n        for part in event.status.message.parts:\n            if hasattr(part, 'text'):\n                print(part.text, end=\"\", flush=True)\n```\n\n### 5. Node.js SDK\n\n```bash\nnpm install @a2a-js/sdk\n```\n\n```javascript\nimport { A2AServer, A2AClient, TaskState } from '@a2a-js/sdk';\n\n// Server\nconst server = new A2AServer({\n  agentCard: {\n    name: 'Code Reviewer', description: 'Reviews code for bugs and best practices',\n    url: 'https://code-reviewer.example.com', version: '1.0.0',\n    capabilities: { streaming: true },\n    skills: [{ id: 'review', name: 'Code Review', description: 'Analyze code for issues', tags: ['code', 'review'] }],\n    defaultInputModes: ['text/plain'], defaultOutputModes: ['text/plain'],\n  },\n  async onMessage(context, eventQueue) {\n    const userText = context.getUserMessage().parts[0].text;\n    await eventQueue.enqueue({ status: { state: TaskState.WORKING, message: { role: 'agent', parts: [{ text: 'Reviewing...' }] } } });\n    const review = await reviewCode(userText);\n    await eventQueue.enqueue({ status: { state: TaskState.COMPLETED, message: { role: 'agent', parts: [{ text: review }] } } });\n  },\n});\nserver.listen(8000);\n\n// Client\nconst client = await A2AClient.fromAgentCardUrl('https://code-reviewer.example.com/.well-known/agent.json');\nconst response = await client.sendMessage({\n  message: { role: 'user', parts: [{ text: 'Review: function add(a,b) { return a + b; }' }] },\n});\n```\n\n### 6. Multi-Agent Orchestration\n\n```python\n# Sequential: research → write → review\nresearch_agent = await A2AClient.get_client_from_agent_card_url(\"https://research-agent.example.com/.well-known/agent.json\")\nwriter_agent = await A2AClient.get_client_from_agent_card_url(\"https://writer-agent.example.com/.well-known/agent.json\")\n\nresearch_result = await research_agent.send_message(SendMessageRequest(\n    params=MessageSendParams(message=Message(role=\"user\", parts=[TextPart(text=\"Research quantum computing breakthroughs 2025\")]))\n))\narticle = await writer_agent.send_message(SendMessageRequest(\n    params=MessageSendParams(message=Message(role=\"user\", parts=[TextPart(text=f\"Write blog post: {research_result.status.message.parts[0].text}\")]))\n))\n\n# Parallel fan-out\nimport asyncio\nresults = await asyncio.gather(\n    query_agent(agent_a, \"Analyze market trends\"),\n    query_agent(agent_b, \"Analyze competitor products\"),\n    query_agent(agent_c, \"Analyze customer feedback\"),\n)\n```\n\n### 7. A2A vs MCP\n\n| | A2A | MCP |\n|---|---|---|\n| **Purpose** | Agent-to-agent communication | Agent-to-tool communication |\n| **Actors** | Agent ↔ Agent | Agent ↔ Tool/Data source |\n| **Tasks** | Stateful, long-running, async | Stateless function calls |\n| **Use when** | Delegating to another autonomous agent | Calling a specific tool/API |\n\n## Examples\n\n### Example 1: Customer Support Router\n\n**Input:** \"Build an A2A server that acts as a customer support router. It receives customer queries and delegates to specialized agents: billing-agent, technical-agent, and sales-agent based on the query content.\"\n\n**Output:** A2A server with Agent Card listing routing as its primary skill, message handler that classifies queries, A2A client connections to 3 downstream agents, task forwarding with context preservation, aggregated response, and fallback to human handoff.\n\n### Example 2: Code Pipeline Agents\n\n**Input:** \"Create a multi-agent code pipeline: code-writer generates code, test-writer creates tests, code-reviewer reviews both. Each is an independent A2A server. Build an orchestrator.\"\n\n**Output:** 3 A2A server implementations each with Agent Card and execution logic, orchestrator client with sequential pipeline (write → test → review), streaming updates, and error handling with feedback loops on rejection.\n\n## Guidelines\n\n- Serve the Agent Card at `/.well-known/agent.json` — this is the standard discovery endpoint\n- Use descriptive skill definitions — other agents use these to decide whether to delegate to you\n- Always handle the `input-required` state for human-in-the-loop scenarios\n- Use streaming for tasks that take more than a few seconds\n- Implement task cancellation — long-running tasks must be cancellable\n- Use push notifications for tasks that may take minutes or hours\n- Keep agents focused — one agent, one capability domain\n- Use structured data (JSON Parts) for agent-to-agent, text Parts for human-readable responses\n- Implement authentication on your A2A endpoint — declare the scheme in your Agent Card\n- A2A is for agent collaboration; use MCP for tool integration within a single agent\n- Pin SDK versions — the protocol is evolving (currently v0.3.0)\n","tagline":">-","category":"automation","tags":["agent-skill"],"author":"TerminalSkills","verified":false,"attribution":{"status":"registry_indexed","statusLabel":"Registry indexed","shortLabel":"REGISTRY INDEXED","sourceLabel":"github fast track","sourceDetail":"TerminalSkills/skills","creatorName":"TerminalSkills","creatorUrl":"https://github.com/TerminalSkills","sourceUrl":"https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol","indexedBy":"OpenAgentSkill community index","claimUrl":"https://www.openagentskill.com/skills/terminalskills-a2a-protocol#claim-this-skill","claimCta":"Claim this skill","trustNote":"This listing was indexed from public sources and is not marked official until a maintainer claim is approved.","publicNote":"Attribution links to the public repository or creator profile. Creators can claim the listing to update ownership signals."},"stats":{"stars":145,"forks":16,"verified_installs":0,"successful_runs":0,"total_outcomes":0,"rating":0,"review_count":0,"quality_score":35.25},"quality":{"score":62,"tier":"promising","label":"Promising","summary":"Useful candidate, but compare it with alternatives before adopting.","signals":[{"label":"GitHub stars","value":"145","tone":"neutral"},{"label":"Freshness","value":"1mo ago","tone":"positive"},{"label":"Install ready","value":"Yes","tone":"positive"},{"label":"License","value":"Apache-2.0","tone":"neutral"}],"warnings":[]},"trust":{"version":"trust-score-v5","score":64,"base_score":72,"outcome_confidence":0,"tier":"review","label":"Sandbox only","summary":"Useful candidate with missing or mixed trust signals. Keep it in an isolated workspace until the outcome loop proves task fit.","recommendedAction":"Run only in a sandbox and compare close alternatives before using it for real work.","decision":{"install_policy":"human_review_before_install","auto_install_allowed":false,"human_review_required":true,"sandbox_first":true,"agent_action":"Compare alternatives before installing.","reasoning":["64/100 Trust Score v5","72/100 Trust Score v4 baseline","Needs more real agent outcomes before unattended install","Install path is available","Review before production"],"review_required_when":["The workspace contains production secrets, payments, private customer data, or irreversible actions.","The install command requests shell, network, credential, database, or broad filesystem access.","Outcome evidence is missing, recently failed, or required human review.","Production credentials, payments, or irreversible account changes without explicit human review","Sensitive private data before reviewing repository code, license, and permission surface","Automatic installation in a production workspace"]},"dimensions":[{"id":"github_adoption","label":"GitHub adoption","score":62,"weight":0.13,"status":"info","detail":"145 GitHub stars"},{"id":"repo_activity","label":"Stars/forks activity","score":57,"weight":0.08,"status":"warn","detail":"145 stars, 16 forks; issue activity unavailable in current metadata"},{"id":"maintenance","label":"Recent maintenance","score":88,"weight":0.14,"status":"pass","detail":"1mo since push"},{"id":"license","label":"License clarity","score":86,"weight":0.09,"status":"pass","detail":"Apache-2.0"},{"id":"documentation","label":"README/SKILL.md completeness","score":70,"weight":0.14,"status":"info","detail":"Public metadata needs stronger README/SKILL.md context"},{"id":"dependency_risk","label":"Dependency/runtime risk","score":54,"weight":0.12,"status":"warn","detail":"command execution surface, external package install surface"},{"id":"installability","label":"Install availability","score":92,"weight":0.1,"status":"pass","detail":"npx skills add TerminalSkills/skills --skill a2a-protocol"},{"id":"install_safety","label":"Install command safety","score":92,"weight":0.1,"status":"pass","detail":"standard package or runtime install path"},{"id":"permission_surface","label":"Permission surface","score":48,"weight":0.07,"status":"warn","detail":"shell or command execution, filesystem or document access"},{"id":"repository","label":"Repository evidence","score":86,"weight":0.04,"status":"pass","detail":"https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol"},{"id":"review_status","label":"Review status","score":88,"weight":0.05,"status":"pass","detail":"AI review data available"},{"id":"agent_outcomes","label":"Agent Proven outcomes","score":54,"weight":0.13,"status":"info","detail":"No agent outcome data yet"}],"checks":[{"status":"info","label":"GitHub adoption","detail":"145 GitHub stars"},{"status":"warn","label":"Stars/forks activity","detail":"145 stars, 16 forks; 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require human review before any live investment decision.","Quality score needs review","Permission surface needs review: shell or command execution, filesystem or document access","Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, external package install surface","Permission surface: shell or command execution, filesystem or document access","No real agent outcome reports yet","Human review required before unattended installation"],"evidence":{"stars":"145 GitHub stars","repoActivity":"145 stars, 16 forks","lastPushed":"1mo since push","license":"Apache-2.0","repository":"https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol","install":"npx skills add TerminalSkills/skills --skill a2a-protocol","installSafety":"standard package or runtime install path","permissionSurface":"shell or command execution, filesystem or document access","documentation":"Usable metadata, review docs","agentOutcomes":"No agent outcome data yet","agentProvenScore":0,"outcomeConfidence":"0%","installPolicy":"human_review_before_install"},"installReadiness":{"ready":true,"command":"npx skills add TerminalSkills/skills --skill a2a-protocol","policy":"human_review_before_install","label":"Human review before install","notes":["Install path is available","Repository evidence is available","License is declared","No Agent Proven outcome evidence yet","1mo since push","Financial domain: human review is required before use in a live investment workflow.","Trust Score v5 requires review or sandbox-only use before install."]},"agentCompatibility":["Codex","Claude Code","Cursor","OpenAgentSkill CLI"],"riskSummary":{"level":"medium","label":"Review before production","notes":["Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Permission surface needs review: shell or command execution, filesystem or document access","Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, external package install surface"]},"outcomeEvidence":{"total":0,"successes":0,"failures":0,"notRelevant":0,"successRate":null,"installAttempts":0,"riskBlocked":0,"setupRequired":0,"installSuccessRate":null,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"recentSuccessRate":null,"recentFailureRate":null,"uniqueAgents":0,"agentProvenScore":0,"agentProvenLabel":"Needs first agent run","lastOutcomeAt":null,"label":"No agent outcome data yet"},"autoInstall":{"allowed":false,"sandboxRequired":true,"policy":"human_review_before_install","reason":"Compare alternatives before installing."},"outcome_loop":{"version":"openagentskill-agent-outcome-v4","required_after_install":true,"endpoint":"/api/agent/outcome","method":"POST","event_id_source":"feedback.event_id, install_receipt.resolve_event_id, or decision_packet.outcome_feedback.event_id","expected_outcomes":["success","failed","not_relevant","blocked_by_risk","setup_required"],"required_fields":["event_id","skill_slug","task"],"quality_fields":["task_success","output_quality","error_type","human_review_required","used_in_production","workspace","evidence_url","time_to_useful_ms","source_version"],"ranking_inputs_updated":["Trust Score v5 outcome confidence","Agent Proven Score","Resolve ranking task-fit evidence","Skill detail machine-readable metadata","Outcome leaderboard"]},"agent_contract":{"suited_tasks":["automation","agent-skill"],"suited_agents":["Codex","Claude Code","Cursor","OpenAgentSkill CLI"],"install_command":"npx skills add TerminalSkills/skills --skill a2a-protocol","trust_score":64,"trust_version":"trust-score-v5","risk_level":"medium","do_not_use_when":["Production credentials, payments, or irreversible account changes without explicit human review","Sensitive private data before reviewing repository code, license, and permission surface","Automatic installation in a production workspace","Autonomous investment, trading, tax, or suitability decisions without a qualified human review"],"before_install":["Read the audit page and machine-readable metadata.","Confirm the install command, license, and permission surface fit the workspace.","Get explicit human approval or choose an alternative before installing."],"after_run":["Report the outcome to /api/agent/outcome using the resolve event id.","Include output_quality, workspace, human_review_required, and evidence_url when available.","Re-resolve before broad production rollout."]},"bestFor":["automation","agent-skill"],"doNotUseFor":["Production credentials, payments, or irreversible account changes without explicit human review","Sensitive private data before reviewing repository code, license, and permission surface","Automatic installation in a production workspace","Autonomous investment, trading, tax, or suitability decisions without a qualified human review"],"knownRisks":["Financial research output is not financial advice; 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require human review before any live investment decision.","Quality score needs review","Permission surface needs review: shell or command execution, filesystem or document access","Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, external package install surface","Permission surface: shell or command execution, filesystem or document access","No real agent outcome reports yet","Human review required before unattended installation"],"evidence":{"stars":"145 GitHub stars","repoActivity":"145 stars, 16 forks","lastPushed":"1mo since push","license":"Apache-2.0","repository":"https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol","install":"npx skills add TerminalSkills/skills --skill a2a-protocol","installSafety":"standard package or runtime install path","permissionSurface":"shell or command execution, filesystem or document access","documentation":"Usable metadata, review docs","agentOutcomes":"No agent outcome data yet","agentProvenScore":0,"outcomeConfidence":"0%","installPolicy":"human_review_before_install"},"installReadiness":{"ready":true,"command":"npx skills add TerminalSkills/skills --skill a2a-protocol","policy":"human_review_before_install","label":"Human review before install","notes":["Install path is available","Repository evidence is available","License is declared","No Agent Proven outcome evidence yet","1mo since push","Financial domain: human review is required before use in a live investment workflow.","Trust Score v5 requires review or sandbox-only use before install."]},"agentCompatibility":["Codex","Claude Code","Cursor","OpenAgentSkill CLI"],"riskSummary":{"level":"medium","label":"Review before production","notes":["Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Permission surface needs review: shell or command execution, filesystem or document access","Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, external package install surface"]},"outcomeEvidence":{"total":0,"successes":0,"failures":0,"notRelevant":0,"successRate":null,"installAttempts":0,"riskBlocked":0,"setupRequired":0,"installSuccessRate":null,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"recentSuccessRate":null,"recentFailureRate":null,"uniqueAgents":0,"agentProvenScore":0,"agentProvenLabel":"Needs first agent run","lastOutcomeAt":null,"label":"No agent outcome data yet"},"autoInstall":{"allowed":false,"sandboxRequired":true,"policy":"human_review_before_install","reason":"Compare alternatives before installing."},"outcome_loop":{"version":"openagentskill-agent-outcome-v4","required_after_install":true,"endpoint":"/api/agent/outcome","method":"POST","event_id_source":"feedback.event_id, install_receipt.resolve_event_id, or decision_packet.outcome_feedback.event_id","expected_outcomes":["success","failed","not_relevant","blocked_by_risk","setup_required"],"required_fields":["event_id","skill_slug","task"],"quality_fields":["task_success","output_quality","error_type","human_review_required","used_in_production","workspace","evidence_url","time_to_useful_ms","source_version"],"ranking_inputs_updated":["Trust Score v5 outcome confidence","Agent Proven Score","Resolve ranking task-fit evidence","Skill detail machine-readable metadata","Outcome leaderboard"]},"agent_contract":{"suited_tasks":["automation","agent-skill"],"suited_agents":["Codex","Claude Code","Cursor","OpenAgentSkill CLI"],"install_command":"npx skills add TerminalSkills/skills --skill a2a-protocol","trust_score":64,"trust_version":"trust-score-v5","risk_level":"medium","do_not_use_when":["Production credentials, payments, or irreversible account changes without explicit human review","Sensitive private data before reviewing repository code, license, and permission surface","Automatic installation in a production workspace","Autonomous investment, trading, tax, or suitability decisions without a qualified human review"],"before_install":["Read the audit page and machine-readable metadata.","Confirm the install command, license, and permission surface fit the workspace.","Get explicit human approval or choose an alternative before installing."],"after_run":["Report the outcome to /api/agent/outcome using the resolve event id.","Include output_quality, workspace, human_review_required, and evidence_url when available.","Re-resolve before broad production rollout."]},"bestFor":["automation","agent-skill"],"doNotUseFor":["Production credentials, payments, or irreversible account changes without explicit human review","Sensitive private data before reviewing repository code, license, and permission surface","Automatic installation in a production workspace","Autonomous investment, trading, tax, or suitability decisions without a qualified human review"],"knownRisks":["Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Permission surface needs review: shell or command execution, filesystem or document access","Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, external package install surface","Permission surface: shell or command execution, filesystem or document access"],"backward_compatible":{"trust_score_v4":{"version":"trust-score-v4","score":72,"tier":"strong","label":"Strong shortlist","summary":"Good trust signals with a few areas worth checking before rollout."}}},"trust_score_v4":{"version":"trust-score-v4","score":72,"tier":"strong","label":"Strong shortlist","summary":"Good trust signals with a few areas worth checking before rollout.","recommendedAction":"Test in a sandbox workflow and compare its install path with close alternatives.","dimensions":[{"id":"github_adoption","label":"GitHub adoption","score":62,"weight":0.13,"status":"info","detail":"145 GitHub stars"},{"id":"repo_activity","label":"Stars/forks activity","score":57,"weight":0.08,"status":"warn","detail":"145 stars, 16 forks; issue activity unavailable in current metadata"},{"id":"maintenance","label":"Recent maintenance","score":88,"weight":0.14,"status":"pass","detail":"1mo since push"},{"id":"license","label":"License clarity","score":86,"weight":0.09,"status":"pass","detail":"Apache-2.0"},{"id":"documentation","label":"README/SKILL.md completeness","score":70,"weight":0.14,"status":"info","detail":"Public metadata needs stronger README/SKILL.md context"},{"id":"dependency_risk","label":"Dependency/runtime risk","score":54,"weight":0.12,"status":"warn","detail":"command execution surface, external package install surface"},{"id":"installability","label":"Install availability","score":92,"weight":0.1,"status":"pass","detail":"npx skills add TerminalSkills/skills --skill a2a-protocol"},{"id":"install_safety","label":"Install command safety","score":92,"weight":0.1,"status":"pass","detail":"standard package or runtime install path"},{"id":"permission_surface","label":"Permission surface","score":48,"weight":0.07,"status":"warn","detail":"shell or command execution, filesystem or document access"},{"id":"repository","label":"Repository evidence","score":86,"weight":0.04,"status":"pass","detail":"https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol"},{"id":"review_status","label":"Review status","score":88,"weight":0.05,"status":"pass","detail":"AI review data available"},{"id":"agent_outcomes","label":"Agent Proven outcomes","score":54,"weight":0.13,"status":"info","detail":"No agent outcome data yet"}],"checks":[{"status":"info","label":"GitHub adoption","detail":"145 GitHub stars"},{"status":"warn","label":"Stars/forks activity","detail":"145 stars, 16 forks; issue activity unavailable in current metadata"},{"status":"pass","label":"Recent maintenance","detail":"1mo since push"},{"status":"pass","label":"License clarity","detail":"Apache-2.0"},{"status":"info","label":"README/SKILL.md completeness","detail":"Public metadata needs stronger README/SKILL.md context"},{"status":"warn","label":"Dependency/runtime risk","detail":"command execution surface, external package install surface"},{"status":"pass","label":"Install availability","detail":"npx skills add TerminalSkills/skills --skill a2a-protocol"},{"status":"pass","label":"Install command safety","detail":"standard package or runtime install path"},{"status":"warn","label":"Permission surface","detail":"shell or command execution, filesystem or document access"},{"status":"pass","label":"Repository evidence","detail":"https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol"},{"status":"pass","label":"Review status","detail":"AI review data available"},{"status":"info","label":"Agent Proven outcomes","detail":"No agent outcome data yet"},{"status":"warn","label":"Ownership","detail":"No approved owner claim yet"},{"status":"info","label":"OpenAgentSkill usage","detail":"No local usage activity yet"},{"status":"info","label":"Agent outcomes","detail":"No agent outcome data yet"}],"strengths":["AI review approved","Install path is available","Repository evidence is available","Recently maintained repository","Install command has no obvious high-risk pattern"],"warnings":["Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Permission surface needs review: shell or command execution, filesystem or document access","Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, external package install surface","Permission surface: shell or command execution, filesystem or document access"],"evidence":{"stars":"145 GitHub stars","repoActivity":"145 stars, 16 forks","lastPushed":"1mo since push","license":"Apache-2.0","repository":"https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol","install":"npx skills add TerminalSkills/skills --skill a2a-protocol","installSafety":"standard package or runtime install path","permissionSurface":"shell or command execution, filesystem or document access","documentation":"Usable metadata, review docs","agentOutcomes":"No agent outcome data yet"},"installReadiness":{"ready":true,"command":"npx skills add TerminalSkills/skills --skill a2a-protocol","policy":"human_review_before_install","label":"Human review before install","notes":["Install path is available","Repository evidence is available","License is declared","No Agent Proven outcome evidence yet","1mo since push","Financial domain: human review is required before use in a live investment workflow."]},"agentCompatibility":["Codex","Claude Code","Cursor","OpenAgentSkill CLI"],"riskSummary":{"level":"medium","label":"Review before production","notes":["Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Permission surface needs review: shell or command execution, filesystem or document access","Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, external package install surface"]},"outcomeEvidence":{"total":0,"successes":0,"failures":0,"notRelevant":0,"successRate":null,"installAttempts":0,"riskBlocked":0,"setupRequired":0,"installSuccessRate":null,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"recentSuccessRate":null,"recentFailureRate":null,"uniqueAgents":0,"agentProvenScore":0,"agentProvenLabel":"Needs first agent run","lastOutcomeAt":null,"label":"No agent outcome data yet"},"autoInstall":{"allowed":false,"sandboxRequired":true,"policy":"human_review_before_install","reason":"Human review or sandbox validation is required before automatic installation."},"bestFor":["automation","agent-skill"],"doNotUseFor":["Production credentials, payments, or irreversible account changes without explicit human review","Sensitive private data before reviewing repository code, license, and permission surface","Automatic installation in a production workspace","Autonomous investment, trading, tax, or suitability decisions without a qualified human review"],"knownRisks":["Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Permission surface needs review: shell or command execution, filesystem or document access","Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, external package install surface","Permission surface: shell or command execution, filesystem or document access"]},"agent_proven":{"version":"agent-proven-v1","score":0,"tier":"unproven","label":"Needs first agent run","summary":"No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.","metrics":{"totalOutcomes":0,"successfulOutcomes":0,"failedOutcomes":0,"installAttempts":0,"installSuccessRate":null,"successRate":null,"recentSuccessRate":null,"recentFailureRate":null,"riskBlocked":0,"setupRequired":0,"notRelevant":0,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"uniqueAgents":0,"lastOutcomeAt":null},"signals":[],"penalties":["No real agent outcome evidence yet"]},"outcome_stats":null,"safety":{"score":31,"level":"avoid_auto_install","label":"Avoid automatic install","safety_tier":{"tier":"blocked","label":"Blocked for auto-install","badge":"BLOCKED","summary":"This skill should not be selected by an agent without explicit human security review.","recommended_action":"Do not auto-install. Inspect the source, dependencies, and permission surface first.","auto_install_policy":"block","reasons":["Metadata combines secrets access with shell or command execution","High-risk permission hints: Shell or command execution, Secrets or environment access"]},"auto_install_allowed":false,"human_review_required":true,"blocked":true,"audit_risk":"needs_review","permission_hints":[{"id":"shell","label":"Shell or command execution","reason":"Skill metadata references terminal, CLI, shell, subprocess, or command execution workflows.","severity":"high"},{"id":"network","label":"Network access","reason":"Skill likely fetches remote pages, APIs, repositories, or external services.","severity":"medium"},{"id":"filesystem","label":"Filesystem access","reason":"Skill may read or write project files, documents, generated artifacts, or local workspace state.","severity":"medium"},{"id":"secrets","label":"Secrets or environment access","reason":"Skill metadata references credentials, tokens, environment variables, or secret-bearing workflows.","severity":"high"},{"id":"database","label":"Database access","reason":"Skill may inspect schemas, query databases, or work with persistent stores.","severity":"medium"}],"policy_warnings":["High-risk permission hints: Shell or command execution, Secrets or environment access","Dependency or permission surface needs review"],"constraints_applied":{"max_risk":"medium","needs_install_command":true,"min_stars":0}},"safety_gate":{"tier":"blocked","label":"Blocked for auto-install","badge":"BLOCKED","auto_install_policy":"block","auto_install_allowed":false,"blocked":true,"human_review_required":true,"recommended_action":"Do not auto-install. Inspect the source, dependencies, and permission surface first.","reasons":["Metadata combines secrets access with shell or command execution","High-risk permission hints: Shell or command execution, Secrets or environment access"]},"eval":{"version":"openagentskill-skill-eval-v1","status":"failed","score":63,"risk_level":"high","decision":{"recommendation":"do_not_auto_install","reason":"Agent safety gate: This skill should not be selected by an agent without explicit human security review.","auto_install_allowed":false,"policy":"block","human_review_required":true},"blockers":["Agent safety gate: This skill should not be selected by an agent without explicit human security review.","Permission surface: shell or command execution, filesystem or document access"],"warnings":["Trust score: Good trust signals with a few areas worth checking before rollout.","Audit score: Needs review","README/SKILL.md completeness: Public metadata needs stronger README/SKILL.md context","High-risk permission hints: Shell or command execution, Secrets or environment access","Dependency or permission surface needs review","Permission surface may require sandboxing","Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Permission surface needs review: shell or command execution, filesystem or document access","Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, external package install surface"],"validation_plan":["Inspect repository, README/SKILL.md, license, and recent commits before production use.","Install in an isolated workspace or sandbox with no production secrets available.","Run the smallest representative task and record files touched, commands run, network access, and outputs.","Compare the selected skill against at least one alternative when the eval status is review or failed.","Promote only after the agent reports a successful verification result and unresolved warnings are accepted."],"checks":[{"id":"task_fit","label":"Task fit","status":"pass","score":84,"required_for_auto_install":true,"detail":"Task wording matches this skill metadata.","evidence":["Evaluate a2a-protocol before installing it in an agent workflow","automation","Research agents workflows; Claude Code teams; builders willing to evaluate younger projects"]},{"id":"install_path","label":"Install path","status":"pass","score":92,"required_for_auto_install":true,"detail":"Install handoff is available.","evidence":["npx skills add TerminalSkills/skills --skill a2a-protocol"]},{"id":"install_safety","label":"Install command safety","status":"pass","score":92,"required_for_auto_install":true,"detail":"standard package or runtime install path","evidence":["npx skills add TerminalSkills/skills --skill a2a-protocol"]},{"id":"trust_score","label":"Trust score","status":"warn","score":72,"required_for_auto_install":true,"detail":"Good trust signals with a few areas worth checking before rollout.","evidence":["Strong shortlist","145 GitHub stars","Apache-2.0"]},{"id":"audit_score","label":"Audit score","status":"warn","score":75,"required_for_auto_install":true,"detail":"Needs review","evidence":["Dependency or permission surface needs review"]},{"id":"agent_safety_gate","label":"Agent safety gate","status":"fail","score":31,"required_for_auto_install":true,"detail":"This skill should not be selected by an agent without explicit human security review.","evidence":["Do not auto-install. Inspect the source, dependencies, and permission surface first.","Metadata combines secrets access with shell or command execution"]},{"id":"readme_skillmd_completeness","label":"README/SKILL.md completeness","status":"warn","score":70,"required_for_auto_install":false,"detail":"Public metadata needs stronger README/SKILL.md context","evidence":["Usable metadata, review docs"]},{"id":"license_clarity","label":"License clarity","status":"pass","score":86,"required_for_auto_install":true,"detail":"Apache-2.0","evidence":["Apache-2.0"]},{"id":"recent_maintenance","label":"Recent maintenance","status":"pass","score":88,"required_for_auto_install":false,"detail":"1mo since push","evidence":["1mo since push"]},{"id":"permission_surface","label":"Permission surface","status":"fail","score":48,"required_for_auto_install":true,"detail":"shell or command execution, filesystem or document access","evidence":["Shell or command execution: high","Network access: medium","Filesystem access: medium"]},{"id":"alternatives","label":"Alternatives available","status":"info","score":55,"required_for_auto_install":false,"detail":"No close alternatives were found in the current shortlist.","evidence":[]}],"endpoints":{"web":"https://www.openagentskill.com/skills/terminalskills-a2a-protocol/evals","api":"/api/agent/evals?slug=terminalskills-a2a-protocol","text":"/api/agent/evals?slug=terminalskills-a2a-protocol&format=text"}},"agent_readable_metadata":{"version":"openagentskill-agent-metadata-v2","skill":{"slug":"terminalskills-a2a-protocol","name":"a2a-protocol","description":">-","category":"automation","url":"https://www.openagentskill.com/skills/terminalskills-a2a-protocol","repository":"https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol","github_repo":"TerminalSkills/skills"},"suited_tasks":["Research agents workflows","Claude Code teams","builders willing to evaluate younger projects","Search sources","Extract claims","Synthesize findings","Move data between tools","Transform files"],"suited_agents":["Codex","Claude Code","Cursor","OpenAgentSkill CLI","CLI"],"install":{"command":"npx skills add TerminalSkills/skills --skill a2a-protocol","ready":true,"targets":[{"id":"openagentskill-cli","label":"CLI","kind":"command","value":"npx --yes https://github.com/Leon-Drq/openagentskill/releases/download/cli-v0.3.0/openagentskill-0.3.0.tgz add terminalskills-a2a-protocol"},{"id":"codex","label":"Codex","kind":"agent-prompt","value":"Install the \"a2a-protocol\" agent skill from https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol. Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: >- After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"terminalskills-a2a-protocol\",\"task\":\"Install a2a-protocol\",\"agent\":\"codex\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."},{"id":"claude-code","label":"Claude Code","kind":"agent-prompt","value":"Add \"a2a-protocol\" as a Claude Code skill from https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol. Inspect the skill instructions, place the reusable skill files in the appropriate local skills location for this project, and report the activation steps. Skill purpose: >- After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"terminalskills-a2a-protocol\",\"task\":\"Install a2a-protocol\",\"agent\":\"claude-code\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."},{"id":"cursor","label":"Cursor","kind":"agent-prompt","value":"Turn \"a2a-protocol\" from https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: >- After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"terminalskills-a2a-protocol\",\"task\":\"Install a2a-protocol\",\"agent\":\"cursor\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."}],"handoff_url":"https://www.openagentskill.com/api/skills/terminalskills-a2a-protocol/install","manifest_url":"https://www.openagentskill.com/api/registry/manifest/terminalskills-a2a-protocol"},"trust":{"score":72,"label":"Strong shortlist","version":"trust-score-v4","install_policy":"human_review_before_install","evidence":{"stars":"145 GitHub stars","repoActivity":"145 stars, 16 forks","lastPushed":"1mo since push","license":"Apache-2.0","repository":"https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol","install":"npx skills add TerminalSkills/skills --skill a2a-protocol","installSafety":"standard package or runtime install path","permissionSurface":"shell or command execution, filesystem or document access","documentation":"Usable metadata, review docs","agentOutcomes":"No agent outcome data yet"},"outcome_evidence":{"total":0,"successes":0,"failures":0,"not_relevant":0,"success_rate":null,"recent_success_rate":null,"recent_failure_rate":null,"install_attempts":0,"install_success_rate":null,"risk_blocked":0,"setup_required":0,"avg_output_quality":null,"production_outcomes":0,"last_outcome_at":null,"label":"No agent outcome data yet"},"auto_install":{"allowed":false,"sandbox_required":true,"reason":"Human review or sandbox validation is required before automatic installation."},"best_for":["automation","agent-skill"],"known_risks":["Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Permission surface needs review: shell or command execution, filesystem or document access","Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, external package install surface","Permission surface: shell or command execution, filesystem or document access"]},"agent_proven":{"version":"agent-proven-v1","score":0,"tier":"unproven","label":"Needs first agent run","summary":"No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.","metrics":{"totalOutcomes":0,"successfulOutcomes":0,"failedOutcomes":0,"installAttempts":0,"installSuccessRate":null,"successRate":null,"recentSuccessRate":null,"recentFailureRate":null,"riskBlocked":0,"setupRequired":0,"notRelevant":0,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"uniqueAgents":0,"lastOutcomeAt":null},"signals":[],"penalties":["No real agent outcome evidence yet"]},"audit":{"score":75,"risk_level":"needs_review","risk_label":"Needs review","warnings":["Dependency or permission surface needs review","Permission surface may require sandboxing","Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Permission surface needs review: shell or command execution, filesystem or document access","Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, external package install surface"]},"safety_gate":{"tier":"blocked","label":"Blocked for auto-install","auto_install_policy":"block","auto_install_allowed":false,"human_review_required":true,"blocked":true,"recommended_action":"Do not auto-install. Inspect the source, dependencies, and permission surface first."},"quality":{"score":62,"label":"Promising"},"supply":{"track":"Coding and developer agents","scenario":"GitHub automation","maintenance":"1mo since push","risk":"Needs review"},"alternative_skills":[],"do_not_use_when":["teams that need a vendor-supported SLA","high-compliance environments without internal security review","No OpenAgentSkill engagement data yet","High-risk permission hints: Shell or command execution, Secrets or environment access","Dependency or permission surface needs review","Permission surface may require sandboxing","Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision."],"agent_contract":{"task_input":"Use a2a-protocol in an agent workflow","recommended_action":"Do not auto-install. Inspect the source, dependencies, and permission surface first.","install_policy":"block","minimum_review_before_use":["Trust: 72/100 Strong shortlist","Audit: 75/100 Needs review","Safety: 31/100 Avoid automatic install","Review repository, license, install command, and permission surface before production use."],"expected_agent_output":{"selected_skill":"terminalskills-a2a-protocol (a2a-protocol)","install_command":"npx skills add TerminalSkills/skills --skill a2a-protocol","risk_summary":"Needs review; Blocked for auto-install; Review before production","verification_result":"Report the smallest successful task, files touched, warnings, and any missing setup."}},"outcome_feedback":{"endpoint":"https://www.openagentskill.com/api/agent/outcome","method":"POST","requires_resolve_event_id":true,"event_id_source":"Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.","expected_outcomes":["success","failed","not_relevant","blocked_by_risk","setup_required"],"payload_template":{"event_id":"<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>","skill_slug":"terminalskills-a2a-protocol","task":"Use a2a-protocol in an agent workflow","agent":"codex","outcome":"success","install_used":true,"risk_blocked":false,"setup_required":false,"task_success":true,"output_quality":4,"error_type":null,"human_review_required":false,"workspace":"sandbox","time_to_useful_ms":120000,"notes":"Report the smallest successful task, setup friction, files touched, and risk notes."}},"endpoints":{"web":"https://www.openagentskill.com/skills/terminalskills-a2a-protocol","api":"https://www.openagentskill.com/api/agent/skills/terminalskills-a2a-protocol","audit":"https://www.openagentskill.com/skills/terminalskills-a2a-protocol/audit","eval":"https://www.openagentskill.com/api/agent/evals?slug=terminalskills-a2a-protocol&task=Use%20a2a-protocol%20in%20an%20agent%20workflow&max_risk=medium","resolve":"https://www.openagentskill.com/api/agent/resolve?task=Use%20a2a-protocol%20in%20an%20agent%20workflow&agent=codex&max_risk=medium","receipt":"https://www.openagentskill.com/api/agent/receipt?task=Use%20a2a-protocol%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text","install":"https://www.openagentskill.com/api/skills/terminalskills-a2a-protocol/install","manifest":"https://www.openagentskill.com/api/registry/manifest/terminalskills-a2a-protocol"}},"machine_metadata":{"version":"openagentskill-agent-metadata-v2","skill":{"slug":"terminalskills-a2a-protocol","name":"a2a-protocol","description":">-","category":"automation","url":"https://www.openagentskill.com/skills/terminalskills-a2a-protocol","repository":"https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol","github_repo":"TerminalSkills/skills"},"suited_tasks":["Research agents workflows","Claude Code teams","builders willing to evaluate younger projects","Search sources","Extract claims","Synthesize findings","Move data between tools","Transform files"],"suited_agents":["Codex","Claude Code","Cursor","OpenAgentSkill CLI","CLI"],"install":{"command":"npx skills add TerminalSkills/skills --skill a2a-protocol","ready":true,"targets":[{"id":"openagentskill-cli","label":"CLI","kind":"command","value":"npx --yes https://github.com/Leon-Drq/openagentskill/releases/download/cli-v0.3.0/openagentskill-0.3.0.tgz add terminalskills-a2a-protocol"},{"id":"codex","label":"Codex","kind":"agent-prompt","value":"Install the \"a2a-protocol\" agent skill from https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol. Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: >- After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"terminalskills-a2a-protocol\",\"task\":\"Install a2a-protocol\",\"agent\":\"codex\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."},{"id":"claude-code","label":"Claude Code","kind":"agent-prompt","value":"Add \"a2a-protocol\" as a Claude Code skill from https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol. Inspect the skill instructions, place the reusable skill files in the appropriate local skills location for this project, and report the activation steps. Skill purpose: >- After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"terminalskills-a2a-protocol\",\"task\":\"Install a2a-protocol\",\"agent\":\"claude-code\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."},{"id":"cursor","label":"Cursor","kind":"agent-prompt","value":"Turn \"a2a-protocol\" from https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: >- After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"terminalskills-a2a-protocol\",\"task\":\"Install a2a-protocol\",\"agent\":\"cursor\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."}],"handoff_url":"https://www.openagentskill.com/api/skills/terminalskills-a2a-protocol/install","manifest_url":"https://www.openagentskill.com/api/registry/manifest/terminalskills-a2a-protocol"},"trust":{"score":72,"label":"Strong shortlist","version":"trust-score-v4","install_policy":"human_review_before_install","evidence":{"stars":"145 GitHub stars","repoActivity":"145 stars, 16 forks","lastPushed":"1mo since push","license":"Apache-2.0","repository":"https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol","install":"npx skills add TerminalSkills/skills --skill a2a-protocol","installSafety":"standard package or runtime install path","permissionSurface":"shell or command execution, filesystem or document access","documentation":"Usable metadata, review docs","agentOutcomes":"No agent outcome data yet"},"outcome_evidence":{"total":0,"successes":0,"failures":0,"not_relevant":0,"success_rate":null,"recent_success_rate":null,"recent_failure_rate":null,"install_attempts":0,"install_success_rate":null,"risk_blocked":0,"setup_required":0,"avg_output_quality":null,"production_outcomes":0,"last_outcome_at":null,"label":"No agent outcome data yet"},"auto_install":{"allowed":false,"sandbox_required":true,"reason":"Human review or sandbox validation is required before automatic installation."},"best_for":["automation","agent-skill"],"known_risks":["Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Permission surface needs review: shell or command execution, filesystem or document access","Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, external package install surface","Permission surface: shell or command execution, filesystem or document access"]},"agent_proven":{"version":"agent-proven-v1","score":0,"tier":"unproven","label":"Needs first agent run","summary":"No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.","metrics":{"totalOutcomes":0,"successfulOutcomes":0,"failedOutcomes":0,"installAttempts":0,"installSuccessRate":null,"successRate":null,"recentSuccessRate":null,"recentFailureRate":null,"riskBlocked":0,"setupRequired":0,"notRelevant":0,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"uniqueAgents":0,"lastOutcomeAt":null},"signals":[],"penalties":["No real agent outcome evidence yet"]},"audit":{"score":75,"risk_level":"needs_review","risk_label":"Needs review","warnings":["Dependency or permission surface needs review","Permission surface may require sandboxing","Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Permission surface needs review: shell or command execution, filesystem or document access","Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, external package install surface"]},"safety_gate":{"tier":"blocked","label":"Blocked for auto-install","auto_install_policy":"block","auto_install_allowed":false,"human_review_required":true,"blocked":true,"recommended_action":"Do not auto-install. Inspect the source, dependencies, and permission surface first."},"quality":{"score":62,"label":"Promising"},"supply":{"track":"Coding and developer agents","scenario":"GitHub automation","maintenance":"1mo since push","risk":"Needs review"},"alternative_skills":[],"do_not_use_when":["teams that need a vendor-supported SLA","high-compliance environments without internal security review","No OpenAgentSkill engagement data yet","High-risk permission hints: Shell or command execution, Secrets or environment access","Dependency or permission surface needs review","Permission surface may require sandboxing","Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision."],"agent_contract":{"task_input":"Use a2a-protocol in an agent workflow","recommended_action":"Do not auto-install. Inspect the source, dependencies, and permission surface first.","install_policy":"block","minimum_review_before_use":["Trust: 72/100 Strong shortlist","Audit: 75/100 Needs review","Safety: 31/100 Avoid automatic install","Review repository, license, install command, and permission surface before production use."],"expected_agent_output":{"selected_skill":"terminalskills-a2a-protocol (a2a-protocol)","install_command":"npx skills add TerminalSkills/skills --skill a2a-protocol","risk_summary":"Needs review; Blocked for auto-install; Review before production","verification_result":"Report the smallest successful task, files touched, warnings, and any missing setup."}},"outcome_feedback":{"endpoint":"https://www.openagentskill.com/api/agent/outcome","method":"POST","requires_resolve_event_id":true,"event_id_source":"Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.","expected_outcomes":["success","failed","not_relevant","blocked_by_risk","setup_required"],"payload_template":{"event_id":"<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>","skill_slug":"terminalskills-a2a-protocol","task":"Use a2a-protocol in an agent workflow","agent":"codex","outcome":"success","install_used":true,"risk_blocked":false,"setup_required":false,"task_success":true,"output_quality":4,"error_type":null,"human_review_required":false,"workspace":"sandbox","time_to_useful_ms":120000,"notes":"Report the smallest successful task, setup friction, files touched, and risk notes."}},"endpoints":{"web":"https://www.openagentskill.com/skills/terminalskills-a2a-protocol","api":"https://www.openagentskill.com/api/agent/skills/terminalskills-a2a-protocol","audit":"https://www.openagentskill.com/skills/terminalskills-a2a-protocol/audit","eval":"https://www.openagentskill.com/api/agent/evals?slug=terminalskills-a2a-protocol&task=Use%20a2a-protocol%20in%20an%20agent%20workflow&max_risk=medium","resolve":"https://www.openagentskill.com/api/agent/resolve?task=Use%20a2a-protocol%20in%20an%20agent%20workflow&agent=codex&max_risk=medium","receipt":"https://www.openagentskill.com/api/agent/receipt?task=Use%20a2a-protocol%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text","install":"https://www.openagentskill.com/api/skills/terminalskills-a2a-protocol/install","manifest":"https://www.openagentskill.com/api/registry/manifest/terminalskills-a2a-protocol"}},"supply_profile":{"track":{"slug":"coding","label":"Coding and developer agents","shortLabel":"Coding","description":"Code review, repo analysis, testing, CI, GitHub, DevOps, and developer workflow skills."},"scenario":{"label":"GitHub automation","description":"I need my agent to triage GitHub issues, review pull requests, and summarize repository changes.","useCases":[{"slug":"research-agents","title":"Research agents"},{"slug":"workflow-automation","title":"Workflow automation"},{"slug":"local-desktop","title":"Local desktop"}]},"applicableAgents":["Claude Code","CLI","Codex","Cursor"],"install":{"ready":true,"command":"npx skills add TerminalSkills/skills --skill a2a-protocol","primaryTarget":"CLI","targetCount":4},"githubQuality":{"stars":145,"starsLabel":"145","forks":16,"license":"Apache-2.0","qualityScore":62,"trustScore":72,"auditScore":75},"maintenance":{"status":"active","label":"1mo since push","daysSincePush":44,"lastPushedAt":"2026-07-26T09:56:01+00:00"},"risk":{"level":"needs_review","label":"Needs review","requiresReview":true,"notes":["Dependency or permission surface needs review","Permission surface may require sandboxing","Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review"]},"coverageTags":["Coding","GitHub automation","automation","agent-skill"]},"audit":{"audit_score":75,"risk_level":"needs_review","risk_label":"Needs review","quality_score":62,"trust_score":72,"maintenance_score":88,"security_score":79,"install_score":92,"warnings":["Dependency or permission surface needs review","Permission surface may require sandboxing","Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Permission surface needs review: shell or command execution, filesystem or document access","Stars/forks activity: 145 stars, 16 forks; issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, external package install surface","Permission surface: shell or command execution, filesystem or document access"]},"quality_signals":{"model":"v2","star_score":15.15,"usage_score":0,"review_score":5.1,"metadata_score":3,"freshness_score":12},"platforms":["Claude Code"],"use_cases":[{"slug":"research-agents","title":"Research agents","url":"https://www.openagentskill.com/use-cases/research-agents"},{"slug":"workflow-automation","title":"Workflow automation","url":"https://www.openagentskill.com/use-cases/workflow-automation"},{"slug":"local-desktop","title":"Local desktop","url":"https://www.openagentskill.com/use-cases/local-desktop"},{"slug":"browser-automation","title":"Browser automation","url":"https://www.openagentskill.com/use-cases/browser-automation"}],"stacks":[{"slug":"research-report-agent","title":"Research report agent","url":"https://www.openagentskill.com/collections/research-report-agent"},{"slug":"content-growth-agent","title":"Content growth agent","url":"https://www.openagentskill.com/collections/content-growth-agent"},{"slug":"browser-qa-agent","title":"Browser QA agent","url":"https://www.openagentskill.com/collections/browser-qa-agent"}],"install":"npx skills add TerminalSkills/skills --skill a2a-protocol","install_targets":[{"id":"openagentskill-cli","label":"CLI","title":"OpenAgentSkill CLI","kind":"command","value":"npx --yes https://github.com/Leon-Drq/openagentskill/releases/download/cli-v0.3.0/openagentskill-0.3.0.tgz add terminalskills-a2a-protocol","description":"Resolve policy, run the source installer safely, and report a verified install receipt.","copyLabel":"Copy command"},{"id":"codex","label":"Codex","title":"Codex install prompt","kind":"agent-prompt","value":"Install the \"a2a-protocol\" agent skill from https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol. Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: >- After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"terminalskills-a2a-protocol\",\"task\":\"Install a2a-protocol\",\"agent\":\"codex\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Give Codex a repo-aware install prompt when the skill is not available through a local CLI.","copyLabel":"Copy prompt"},{"id":"claude-code","label":"Claude Code","title":"Claude Code skill prompt","kind":"agent-prompt","value":"Add \"a2a-protocol\" as a Claude Code skill from https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol. Inspect the skill instructions, place the reusable skill files in the appropriate local skills location for this project, and report the activation steps. Skill purpose: >- After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"terminalskills-a2a-protocol\",\"task\":\"Install a2a-protocol\",\"agent\":\"claude-code\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this prompt to ask Claude Code to add the skill and explain the local activation steps.","copyLabel":"Copy prompt"},{"id":"cursor","label":"Cursor","title":"Cursor rule prompt","kind":"agent-prompt","value":"Turn \"a2a-protocol\" from https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: >- After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"terminalskills-a2a-protocol\",\"task\":\"Install a2a-protocol\",\"agent\":\"cursor\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this when installing as Cursor project rules or reusable agent instructions.","copyLabel":"Copy prompt"}],"repository":"https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol","github_repo":"TerminalSkills/skills","version":"1.0.0","license":"Apache-2.0","urls":{"web":"https://www.openagentskill.com/skills/terminalskills-a2a-protocol","repository":"https://github.com/TerminalSkills/skills/tree/main/skills/a2a-protocol","api":"/api/agent/skills/terminalskills-a2a-protocol","install_api":"/api/skills/terminalskills-a2a-protocol/install"},"meta":{"created_at":"2026-09-04T11:25:45.417844+00:00","updated_at":"2026-09-04T11:25:45.575916+00:00","agent_friendly":true}}