{"eval":{"version":"openagentskill-skill-eval-v1","slug":"reacherhq-check-if-email-exists","name":"Check If Email Exists","generated_at":"2026-07-04T00:38:46.393Z","task_input":"Evaluate Check If Email Exists before installing it in an AI agent workflow","status":"review","score":85,"risk_level":"medium","decision":{"recommendation":"manual_review","reason":"Review the audit page, then allow agent install in a sandboxed workflow.","auto_install_allowed":false,"policy":"review","human_review_required":true},"task_fit":{"score":94,"suited_tasks":["Workflow automation workflows","Claude Code teams","teams that value GitHub adoption signals","Move data between tools","Transform files","Trigger repeatable actions","Inspect source files","Explain architecture"],"suited_agents":["Rust","Email","Codex","Claude Code","Cursor","OpenAgentSkill CLI","CLI"]},"install":{"command":"npx skills add reacherhq/check-if-email-exists","ready":true,"policy":"review","safety_label":"Review before install","targets":[{"id":"openagentskill-cli","label":"CLI","kind":"command","value":"npx skills add reacherhq/check-if-email-exists"},{"id":"codex","label":"Codex","kind":"agent-prompt","value":"Install the \"Check If Email Exists\" agent skill from https://github.com/reacherhq/check-if-email-exists. 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: Check if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend."},{"id":"claude-code","label":"Claude Code","kind":"agent-prompt","value":"Add \"Check If Email Exists\" as a Claude Code skill from https://github.com/reacherhq/check-if-email-exists. 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: Check if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend."},{"id":"cursor","label":"Cursor","kind":"agent-prompt","value":"Turn \"Check If Email Exists\" from https://github.com/reacherhq/check-if-email-exists 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: Check if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend."}]},"trust":{"score":84,"label":"Strong shortlist","version":"trust-score-v4","evidence":{"stars":"8.8K GitHub stars","repoActivity":"8.8K stars, 632 forks","lastPushed":"4mo since push","license":"Unknown","repository":"https://github.com/reacherhq/check-if-email-exists","install":"npx skills add reacherhq/check-if-email-exists","installSafety":"standard package or runtime install path","permissionSurface":"filesystem or document access, network or browser access","documentation":"Strong README/SKILL.md context","agentOutcomes":"No agent outcome data yet"}},"audit":{"score":86,"risk_level":"safe_to_try","risk_label":"Safe to try","warnings":["License is unclear","License clarity: Unknown"]},"safety_gate":{"score":70,"tier":"reviewed","label":"Reviewed","auto_install_policy":"review","blocked":false,"permission_hints":[{"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"}],"policy_warnings":["License is unclear"]},"checks":[{"id":"task_fit","label":"Task fit","status":"pass","score":94,"required_for_auto_install":true,"detail":"Task wording matches this skill metadata.","evidence":["Evaluate Check If Email Exists before installing it in an AI agent workflow","productivity-automation","Workflow automation workflows; Claude Code teams; teams that value GitHub adoption signals"]},{"id":"install_path","label":"Install path","status":"pass","score":92,"required_for_auto_install":true,"detail":"Install handoff is available.","evidence":["npx skills add reacherhq/check-if-email-exists"]},{"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 reacherhq/check-if-email-exists"]},{"id":"trust_score","label":"Trust score","status":"pass","score":84,"required_for_auto_install":true,"detail":"Good trust signals with a few areas worth checking before rollout.","evidence":["Strong shortlist","8.8K GitHub stars","Unknown"]},{"id":"audit_score","label":"Audit score","status":"pass","score":86,"required_for_auto_install":true,"detail":"Safe to try","evidence":["License is unclear"]},{"id":"agent_safety_gate","label":"Agent safety gate","status":"warn","score":70,"required_for_auto_install":true,"detail":"Good audit and safety signals with no high-risk permission hints in public metadata.","evidence":["Review the audit page, then allow agent install in a sandboxed workflow.","Safe-to-try audit"]},{"id":"readme_skillmd_completeness","label":"README/SKILL.md completeness","status":"pass","score":90,"required_for_auto_install":false,"detail":"Metadata includes enough usage and workflow context","evidence":["Strong README/SKILL.md context"]},{"id":"license_clarity","label":"License clarity","status":"warn","score":42,"required_for_auto_install":true,"detail":"Unknown","evidence":["Unknown"]},{"id":"recent_maintenance","label":"Recent maintenance","status":"warn","score":76,"required_for_auto_install":false,"detail":"4mo since push","evidence":["4mo since push"]},{"id":"permission_surface","label":"Permission surface","status":"warn","score":72,"required_for_auto_install":true,"detail":"filesystem or document access, network or browser access","evidence":["Network access: medium","Filesystem access: medium"]},{"id":"alternatives","label":"Alternatives available","status":"pass","score":82,"required_for_auto_install":false,"detail":"Alternative skills are available for comparison.","evidence":["ohmyzsh-ohmyzsh","excalidraw-excalidraw","appflowy-io-appflowy","novuhq-novu"]}],"blockers":[],"warnings":["Agent safety gate: Good audit and safety signals with no high-risk permission hints in public metadata.","License clarity: Unknown","Recent maintenance: 4mo since push","Permission surface: filesystem or document access, network or browser access","License is unclear"],"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."],"do_not_use_when":["teams that need a vendor-supported SLA","high-compliance environments without internal security review","No major risk signals from current metadata","License is unclear","License clarity: Unknown","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"],"alternatives":[{"slug":"ohmyzsh-ohmyzsh","name":"Ohmyzsh","url":"https://www.openagentskill.com/skills/ohmyzsh-ohmyzsh","stars":188057,"install_command":"npx skills add ohmyzsh/ohmyzsh","trust_score":89,"audit_score":93},{"slug":"excalidraw-excalidraw","name":"Excalidraw","url":"https://www.openagentskill.com/skills/excalidraw-excalidraw","stars":125436,"install_command":"npx skills add excalidraw/excalidraw","trust_score":92,"audit_score":95},{"slug":"appflowy-io-appflowy","name":"AppFlowy","url":"https://www.openagentskill.com/skills/appflowy-io-appflowy","stars":72692,"install_command":"npx skills add AppFlowy-IO/AppFlowy","trust_score":94,"audit_score":95},{"slug":"novuhq-novu","name":"Novu","url":"https://www.openagentskill.com/skills/novuhq-novu","stars":39136,"install_command":"npx skills add novuhq/novu","trust_score":88,"audit_score":92}],"machine_metadata":{"version":"openagentskill-agent-metadata-v2","skill":{"slug":"reacherhq-check-if-email-exists","name":"Check If Email Exists","description":"Check if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend.","category":"productivity-automation","url":"https://www.openagentskill.com/skills/reacherhq-check-if-email-exists","repository":"https://github.com/reacherhq/check-if-email-exists","github_repo":"reacherhq/check-if-email-exists"},"suited_tasks":["Workflow automation workflows","Claude Code teams","teams that value GitHub adoption signals","Move data between tools","Transform files","Trigger repeatable actions","Inspect source files","Explain architecture"],"suited_agents":["Rust","Email","Codex","Claude Code","Cursor","OpenAgentSkill CLI","CLI"],"install":{"command":"npx skills add reacherhq/check-if-email-exists","ready":true,"targets":[{"id":"openagentskill-cli","label":"CLI","kind":"command","value":"npx skills add reacherhq/check-if-email-exists"},{"id":"codex","label":"Codex","kind":"agent-prompt","value":"Install the \"Check If Email Exists\" agent skill from https://github.com/reacherhq/check-if-email-exists. 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: Check if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend."},{"id":"claude-code","label":"Claude Code","kind":"agent-prompt","value":"Add \"Check If Email Exists\" as a Claude Code skill from https://github.com/reacherhq/check-if-email-exists. 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: Check if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend."},{"id":"cursor","label":"Cursor","kind":"agent-prompt","value":"Turn \"Check If Email Exists\" from https://github.com/reacherhq/check-if-email-exists 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: Check if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend."}],"handoff_url":"https://www.openagentskill.com/api/skills/reacherhq-check-if-email-exists/install","manifest_url":"https://www.openagentskill.com/api/registry/manifest/reacherhq-check-if-email-exists"},"trust":{"score":84,"label":"Strong shortlist","version":"trust-score-v4","install_policy":"human_review_before_install","evidence":{"stars":"8.8K GitHub stars","repoActivity":"8.8K stars, 632 forks","lastPushed":"4mo since push","license":"Unknown","repository":"https://github.com/reacherhq/check-if-email-exists","install":"npx skills add reacherhq/check-if-email-exists","installSafety":"standard package or runtime install path","permissionSurface":"filesystem or document access, network or browser access","documentation":"Strong README/SKILL.md context","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":["productivity-automation","email","automation","productivity","email-validation","email-validation-api"],"known_risks":["License is unclear","License clarity: Unknown"]},"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":86,"risk_level":"safe_to_try","risk_label":"Safe to try","warnings":["License is unclear","License clarity: Unknown"]},"safety_gate":{"tier":"reviewed","label":"Reviewed","auto_install_policy":"review","auto_install_allowed":false,"human_review_required":true,"blocked":false,"recommended_action":"Review the audit page, then allow agent install in a sandboxed workflow."},"quality":{"score":96,"label":"Excellent"},"supply":{"track":"Coding and developer agents","scenario":"Coding agents","maintenance":"4mo since push","risk":"Safe to try"},"alternative_skills":[{"slug":"ohmyzsh-ohmyzsh","name":"Ohmyzsh","url":"https://www.openagentskill.com/skills/ohmyzsh-ohmyzsh","stars":188057,"install_command":"npx skills add ohmyzsh/ohmyzsh","trust_score":89,"audit_score":93},{"slug":"excalidraw-excalidraw","name":"Excalidraw","url":"https://www.openagentskill.com/skills/excalidraw-excalidraw","stars":125436,"install_command":"npx skills add excalidraw/excalidraw","trust_score":92,"audit_score":95},{"slug":"appflowy-io-appflowy","name":"AppFlowy","url":"https://www.openagentskill.com/skills/appflowy-io-appflowy","stars":72692,"install_command":"npx skills add AppFlowy-IO/AppFlowy","trust_score":94,"audit_score":95},{"slug":"novuhq-novu","name":"Novu","url":"https://www.openagentskill.com/skills/novuhq-novu","stars":39136,"install_command":"npx skills add novuhq/novu","trust_score":88,"audit_score":92}],"do_not_use_when":["teams that need a vendor-supported SLA","high-compliance environments without internal security review","No major risk signals from current metadata","License is unclear","License clarity: Unknown","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"],"agent_contract":{"task_input":"Evaluate Check If Email Exists before installing it in an AI agent workflow","recommended_action":"Review the audit page, then allow agent install in a sandboxed workflow.","install_policy":"review","minimum_review_before_use":["Trust: 84/100 Strong shortlist","Audit: 86/100 Safe to try","Safety: 70/100 Review before install","Review repository, license, install command, and permission surface before production use."],"expected_agent_output":{"selected_skill":"reacherhq-check-if-email-exists (Check If Email Exists)","install_command":"npx skills add reacherhq/check-if-email-exists","risk_summary":"Safe to try; Reviewed; 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":"reacherhq-check-if-email-exists","task":"Evaluate Check If Email Exists before installing it in an AI 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/reacherhq-check-if-email-exists","api":"https://www.openagentskill.com/api/agent/skills/reacherhq-check-if-email-exists","audit":"https://www.openagentskill.com/skills/reacherhq-check-if-email-exists/audit","eval":"https://www.openagentskill.com/api/agent/evals?slug=reacherhq-check-if-email-exists&task=Evaluate%20Check%20If%20Email%20Exists%20before%20installing%20it%20in%20an%20AI%20agent%20workflow&max_risk=medium","resolve":"https://www.openagentskill.com/api/agent/resolve?task=Evaluate%20Check%20If%20Email%20Exists%20before%20installing%20it%20in%20an%20AI%20agent%20workflow&agent=codex&max_risk=medium","receipt":"https://www.openagentskill.com/api/agent/receipt?task=Evaluate%20Check%20If%20Email%20Exists%20before%20installing%20it%20in%20an%20AI%20agent%20workflow&agent=codex&max_risk=medium&format=text","install":"https://www.openagentskill.com/api/skills/reacherhq-check-if-email-exists/install","manifest":"https://www.openagentskill.com/api/registry/manifest/reacherhq-check-if-email-exists"}},"endpoints":{"web":"https://www.openagentskill.com/skills/reacherhq-check-if-email-exists","api":"https://www.openagentskill.com/api/agent/skills/reacherhq-check-if-email-exists","eval":"https://www.openagentskill.com/api/agent/evals?slug=reacherhq-check-if-email-exists","audit":"https://www.openagentskill.com/skills/reacherhq-check-if-email-exists/audit","resolve":"https://www.openagentskill.com/api/agent/resolve?task=Evaluate%20Check%20If%20Email%20Exists%20before%20installing%20it%20in%20an%20AI%20agent%20workflow&agent=codex&max_risk=medium"}},"meta":{"endpoint":"/api/agent/evals","mode":"skill_eval","purpose":"Pre-install eval contract for a single skill. Agents should read this before installing a reusable skill.","generated_at":"2026-07-04T00:38:46.393Z"}}