invergent-ai
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subagent-task-worker
Pitfalls, examples, and edge cases for workers executing a Surogates subagent task. Loaded automatically when the dispatcher spawns a session bound to a Task (Session.task_id is set).
Registry indexed
Pitfalls, examples, and edge cases for workers executing a Surogates subagent task. Loaded automatically when the dispatcher spawns a session bound to a Task (Session.task_id is set).
Pitfalls, examples, and edge cases for workers executing a Surogates subagent task. Loaded automatically when the dispatcher spawns a session bound to a Task (Session.task_id is set).
Source documentation, not instructions for this website. Review permissions before running any commands.
You're seeing this skill because the dispatcher spawned you for a subagent task — your
Session.task_idis set and the harness has exposed theworker_complete,worker_block, andworker_contextself-tools to you. This skill is the deeper detail beyond the system-prompt basics: good handoff shapes, retry diagnostics, edge cases, and what NOT to do.
See Tasks (Subagent Task Layer) for the conceptual chapter and Tools for the parameter tables.
You're running for a Task. Three self-tools are available only to you, gated by Session.task_id:
| Tool | Use it when |
|---|---|
worker_context | At the start of your run, especially on retry. Returns goal, accumulated context (from prior unblocks), parent task results, and prior attempt summaries. |
worker_complete | When you've actually finished. Writes the explicit summary + structured metadata to the task row; the parent agent sees this in its worker.complete event. |
worker_block | When you need new context that isn't available without a human or peer providing it. Does NOT consume a retry attempt. |
You also have the same tool surface a spawn_worker child would have: read/write files, web, terminal, etc. -- subject to the AgentDef filter pinned to this attempt.
The first thing you should do on a non-trivial task is worker_context. It tells you:
goal.context accumulated from prior unblocks (timestamped).attempt_count -- if > 1, you are a retry. Read the prior_attempts list before doing anything.parents -- if non-empty, each entry's result and result_metadata is the upstream work you're building on. Don't re-derive it.Your initial USER_MESSAGE already includes a short summary of prior attempts (when attempt_count > 1), bounded to the last 5. worker_context is how you read the full detail.
summary + metadata shapesworker_complete(summary, metadata) is how downstream readers (the parent agent, future retries, humans) understand what you did. Aim for summary to be 1-3 sentences a human can scan; metadata to be machine-readable facts.
Coding task:
worker_complete(
summary="shipped rate limiter — token bucket keyed on user_id with IP fallback; 14 tests pass",
metadata={
"changed_files": ["rate_limiter.py", "tests/test_rate_limiter.py"],
"tests_run": 14,
"tests_passed": 14,
"decisions": ["user_id primary; IP fallback for unauthenticated requests"],
},
)
Coding task that needs human review:
For most code-changing work, "done" should mean "human reviewed and approved." Use worker_block instead of worker_complete, with a reason that starts review-required:. Leave the structured info (diff path, test counts, what to look at) for the parent agent or human to discover via worker_context.
# (NOT worker_complete — block instead so a reviewer steps in)
worker_block(
reason=(
"review-required: rate limiter shipped, 14/14 tests pass — "
"needs eyes on the user_id-vs-IP fallback choice before merge"
),
)
A reviewer (human, or another task spawned by the orchestrator) then calls unblock_task to resume you, OR cancel_task if a fresh attempt is wanted.
Research task:
worker_complete(
summary="3 inference servers reviewed; vLLM wins on throughput, SGLang on latency, TRT-LLM on memory",
metadata={
"sources_read": 12,
"recommendation": "vLLM",
"benchmarks": {"vllm": 1.0, "sglang": 0.87, "trtllm": 0.72},
},
)
Review task:
worker_complete(
summary="reviewed PR #123; 2 blocking issues: SQL injection in /search, missing CSRF on /settings",
metadata={
"pr_number": 123,
"findings": [
{"severity": "critical", "file": "api/search.py", "line": 42, "issue": "raw SQL concat"},
{"severity": "high", "file": "api/settings.py", "issue": "missing CSRF middleware"},
],
"approved": False,
},
)
Shape metadata so downstream parsers (the parent orchestrator, an aggregator task, a reviewer skill) can use it without re-reading your prose.
Because you were spawned into a fan-out, you also have share_note, read_board, and expand_note: a shared, verified board that all sibling workers, retries, and the coordinator read. This is how your discoveries help peers while they work, instead of only at handoff time.
When to write (batch related notes into one share_note call):
outcome=…|evidence=…|risk=… where the evidence names a check you ACTUALLY ran and what it printed. Your latest RESULT replaces your previous one.When to read: [Board update] messages arrive in your history automatically as peers post. Additionally call read_board at decision points — before committing to an approach, and before retrying anything that smells like a known dead end — because inline updates may be stale (superseded results, expired claims).
Notes are admission-verified: vague or unevidenced notes are rejected with a reason. Write them anchored the first time. Sharing on the board does NOT replace worker_complete — the board is live coordination; the completion summary is your durable handoff.
Bad: "stuck". The human or parent has no context.
Good: one sentence naming the specific decision. If you need more context to justify the question, do it in the work you've done so far -- don't stuff a paragraph into the reason. The parent/human can call worker_context to read your full state.
worker_block(
reason=(
"Rate-limit key choice: should I key on IP (simple, NAT-unsafe) "
"or user_id (requires auth — skips anonymous endpoints)?"
),
)
When worker_context returns task.attempt_count > 1, you are a retry. The prior_attempts array tells you what earlier sessions did:
outcome: "completed" -- they emitted a structured summary but the task was reopened (rare). Their summary is in the entry. Don't redo their work.outcome: "blocked" -- a previous attempt blocked; an unblock_task re-launched you. Read the accumulated task.context for what was added on unblock.outcome: "crashed" -- the prior session ended without emitting either a complete or block event (crash, OOM, timeout, hard-kill). No structured summary is available; check the parent's events or worker_context for any clue.Don't repeat what failed. If three prior attempts crashed at the same step, change your approach, narrow scope, or block for guidance.
If your session has org_id set, you are scoped to that tenant. Any persistent memory you write should be prefixed by the tenant so context doesn't leak across orgs. The Surogates memory tool generally namespaces by tenant automatically; if you write directly to shared scratch files, prefix manually.
delegate_task as a substitute for spawn_task. delegate_task is a synchronous fork-join for short reasoning subtasks inside YOUR run; spawn_task is for durable cross-agent handoffs that outlive one API loop.spawn_task if you are a leaf worker. Children spawned by either spawn_worker or spawn_task have WORKER_EXCLUDED_TOOLS applied; if spawn_task is in your toolset, you're an orchestrator-shaped session (and you should see the orchestrator skill instead).worker_block to ask for help; the retry budget is not consumed by blocking.task_id from each spawn_task call and reference them in your worker_complete summary by quoting the actual return value, not making one up.Task state can change between dispatch and your startup. Between when the dispatcher claimed the task and your process boot, the task may have been cancelled or reblocked. Always worker_context first. If the task is no longer running (e.g. cancelled or blocked), stop — you shouldn't be doing the work.
Your attempt may have been reclaimed. If the session lease expired while you were inside a long-running tool call, the dispatcher's stale-claim recovery may have started a new attempt. The worker_complete / worker_block tools refuse with "this attempt is no longer the current task attempt" — that's the signal. Exit cleanly; the new attempt has the work.
Don't rely on a CLI. The task_* tools work uniformly across all execution backends (sandbox, Modal, remote SSH). There is no surogates kanban CLI to fall back on — use the tool surface.
Read your parents' results. When the task has parents, each parent's result and result_metadata is the upstream work. The orchestrator placed you here because their output is your input. Read it via worker_context; don't re-derive.
name: subagent-task-worker description: "Pitfalls, examples, and edge cases for workers executing a Surogates subagent task. Loaded automatically when the dispatcher spawns a session bound to a Task (Session.task_id is set)." version: 1.0.0 license: MIT
---
name: subagent-task-worker
description: "Pitfalls, examples, and edge cases for workers executing a Surogates subagent task. Loaded automatically when the dispatcher spawns a session bound to a Task (Session.task_id is set)."
version: 1.0.0
license: MIT
---
# Subagent Task Worker — Pitfalls and Examples
> You're seeing this skill because the dispatcher spawned you for a subagent task — your `Session.task_id` is set and the harness has exposed the `worker_complete`, `worker_block`, and `worker_context` self-tools to you. This skill is the deeper detail beyond the system-prompt basics: good handoff shapes, retry diagnostics, edge cases, and what NOT to do.
See [Tasks (Subagent Task Layer)](../../../docs/tasks/index.md) for the conceptual chapter and [Tools](../../../docs/tools/index.md) for the parameter tables.
## What you have access to
You're running for a Task. Three self-tools are available only to you, gated by `Session.task_id`:
| Tool | Use it when |
|---|---|
| `worker_context` | At the start of your run, *especially* on retry. Returns goal, accumulated context (from prior unblocks), parent task results, and prior attempt summaries. |
| `worker_complete` | When you've actually finished. Writes the explicit summary + structured metadata to the task row; the parent agent sees this in its `worker.complete` event. |
| `worker_block` | When you need new context that isn't available without a human or peer providing it. Does NOT consume a retry attempt. |
You also have the same tool surface a `spawn_worker` child would have: read/write files, web, terminal, etc. -- subject to the `AgentDef` filter pinned to this attempt.
## Step 0 — Orient yourself
The first thing you should do on a non-trivial task is `worker_context`. It tells you:
- The original `goal`.
- Any `context` accumulated from prior unblocks (timestamped).
- `attempt_count` -- if > 1, you are a retry. Read the `prior_attempts` list before doing anything.
- `parents` -- if non-empty, each entry's `result` and `result_metadata` is the upstream work you're building on. Don't re-derive it.
Your initial USER_MESSAGE already includes a short summary of prior attempts (when `attempt_count > 1`), bounded to the last 5. `worker_context` is how you read the full detail.
## Good `summary` + `metadata` shapes
`worker_complete(summary, metadata)` is how downstream readers (the parent agent, future retries, humans) understand what you did. Aim for `summary` to be 1-3 sentences a human can scan; `metadata` to be machine-readable facts.
**Coding task:**
```python
worker_complete(
summary="shipped rate limiter — token bucket keyed on user_id with IP fallback; 14 tests pass",
metadata={
"changed_files": ["rate_limiter.py", "tests/test_rate_limiter.py"],
"tests_run": 14,
"tests_passed": 14,
"decisions": ["user_id primary; IP fallback for unauthenticated requests"],
},
)
```
**Coding task that needs human review:**
For most code-changing work, "done" should mean "human reviewed and approved." Use `worker_block` instead of `worker_complete`, with a `reason` that starts `review-required:`. Leave the structured info (diff path, test counts, what to look at) for the parent agent or human to discover via `worker_context`.
```python
# (NOT worker_complete — block instead so a reviewer steps in)
worker_block(
reason=(
"review-required: rate limiter shipped, 14/14 tests pass — "
"needs eyes on the user_id-vs-IP fallback choice before merge"
),
)
```
A reviewer (human, or another task spawned by the orchestrator) then calls `unblock_task` to resume you, OR `cancel_task` if a fresh attempt is wanted.
**Research task:**
```python
worker_complete(
summary="3 inference servers reviewed; vLLM wins on throughput, SGLang on latency, TRT-LLM on memory",
metadata={
"sources_read": 12,
"recommendation": "vLLM",
"benchmarks": {"vllm": 1.0, "sglang": 0.87, "trtllm": 0.72},
},
)
```
**Review task:**
```python
worker_complete(
summary="reviewed PR #123; 2 blocking issues: SQL injection in /search, missing CSRF on /settings",
metadata={
"pr_number": 123,
"findings": [
{"severity": "critical", "file": "api/search.py", "line": 42, "issue": "raw SQL concat"},
{"severity": "high", "file": "api/settings.py", "issue": "missing CSRF middleware"},
],
"approved": False,
},
)
```
Shape `metadata` so downstream parsers (the parent orchestrator, an aggregator task, a reviewer skill) can use it without re-reading your prose.
## The coordination board — share as you work
Because you were spawned into a fan-out, you also have `share_note`, `read_board`, and `expand_note`: a shared, verified board that all sibling workers, retries, and the coordinator read. This is how your discoveries help peers *while they work*, instead of only at handoff time.
When to write (batch related notes into one `share_note` call):
- **FAIL — highest value, post immediately.** You tried something and it dead-ended: name what you ran and the observed error. A sibling is one note away from repeating it.
- **FACT** for reusable knowledge anchored to specifics (path, symbol, endpoint, error class). Not narration — anchors a peer can act on.
- **CLAIM** before starting a substantial unit of work that a sibling might also pick ("claiming the slack adapter"). Expires automatically; re-post to renew.
- **RESULT** when you have a candidate outcome, as `outcome=…|evidence=…|risk=…` where the evidence names a check you ACTUALLY ran and what it printed. Your latest RESULT replaces your previous one.
When to read: `[Board update]` messages arrive in your history automatically as peers post. Additionally call `read_board` at decision points — before committing to an approach, and before retrying anything that smells like a known dead end — because inline updates may be stale (superseded results, expired claims).
Notes are admission-verified: vague or unevidenced notes are rejected with a reason. Write them anchored the first time. Sharing on the board does NOT replace `worker_complete` — the board is live coordination; the completion summary is your durable handoff.
## Block reasons that get answered fast
Bad: `"stuck"`. The human or parent has no context.
Good: one sentence naming the specific decision. If you need more context to justify the question, do it in the work you've done so far -- don't stuff a paragraph into the reason. The parent/human can call `worker_context` to read your full state.
```python
worker_block(
reason=(
"Rate-limit key choice: should I key on IP (simple, NAT-unsafe) "
"or user_id (requires auth — skips anonymous endpoints)?"
),
)
```
## Retry scenarios
When `worker_context` returns `task.attempt_count > 1`, you are a retry. The `prior_attempts` array tells you what earlier sessions did:
- `outcome: "completed"` -- they emitted a structured summary but the task was reopened (rare). Their `summary` is in the entry. Don't redo their work.
- `outcome: "blocked"` -- a previous attempt blocked; an `unblock_task` re-launched you. Read the accumulated `task.context` for what was added on unblock.
- `outcome: "crashed"` -- the prior session ended without emitting either a complete or block event (crash, OOM, timeout, hard-kill). No structured summary is available; check the parent's events or `worker_context` for any clue.
**Don't repeat what failed.** If three prior attempts crashed at the same step, change your approach, narrow scope, or block for guidance.
## Tenant isolation
If your session has `org_id` set, you are scoped to that tenant. Any persistent memory you write should be prefixed by the tenant so context doesn't leak across orgs. The Surogates memory tool generally namespaces by tenant automatically; if you write directly to shared scratch files, prefix manually.
## Do NOT
- **Call `delegate_task` as a substitute for `spawn_task`.** `delegate_task` is a synchronous fork-join for short reasoning subtasks inside YOUR run; `spawn_task` is for durable cross-agent handoffs that outlive one API loop.
- **Call `spawn_task` if you are a leaf worker.** Children spawned by either `spawn_worker` or `spawn_task` have `WORKER_EXCLUDED_TOOLS` applied; if `spawn_task` is in your toolset, you're an orchestrator-shaped session (and you should see the [orchestrator skill](../subagent-task-orchestrator/SKILL.md) instead).
- **Complete a task you didn't actually finish.** Use `worker_block` to ask for help; the retry budget is not consumed by blocking.
- **Modify files outside your sandbox workspace** unless the task body says to. The parent's workspace is shared via inheritance; don't surprise it.
- **Hand-write task ids into your prose.** When you spawn child tasks (only if you're an orchestrator-shaped worker), keep the returned `task_id` from each `spawn_task` call and reference them in your `worker_complete` summary by quoting the actual return value, not making one up.
## Pitfalls
**Task state can change between dispatch and your startup.** Between when the dispatcher claimed the task and your process boot, the task may have been cancelled or reblocked. Always `worker_context` first. If the task is no longer `running` (e.g. `cancelled` or `blocked`), stop — you shouldn't be doing the work.
**Your attempt may have been reclaimed.** If the session lease expired while you were inside a long-running tool call, the dispatcher's stale-claim recovery may have started a new attempt. The `worker_complete` / `worker_block` tools refuse with "this attempt is no longer the current task attempt" — that's the signal. Exit cleanly; the new attempt has the work.
**Don't rely on a CLI.** The `task_*` tools work uniformly across all execution backends (sandbox, Modal, remote SSH). There is no `surogates kanban` CLI to fall back on — use the tool surface.
**Read your parents' results.** When the task has `parents`, each parent's `result` and `result_metadata` is the upstream work. The orchestrator placed you here because their output is your input. Read it via `worker_context`; don't re-derive.
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
Version reported in registry metadata; check source releases before relying on it.
Quality
55/100
Promising
Trust
60/100
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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"Low GitHub adoption signal",
"AI review approval is missing",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, shell or command execution",
"GitHub adoption: 25 GitHub stars",
"Stars/forks activity: 25 stars, 1 forks; issue activity unavailable in current metadata"
]
},
"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": 55,
"label": "Promising"
},
"supply": {
"track": "Research and knowledge work",
"scenario": "Workflow automation",
"maintenance": "6d since push",
"risk": "Needs review"
},
"alternative_skills": [],
"do_not_use_when": [
"teams that need a vendor-supported SLA",
"production agents without a repository review",
"Low GitHub adoption signal",
"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",
"AI review approval is missing"
],
"agent_contract": {
"task_input": "Use subagent-task-worker 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: 68/100 Manual review",
"Audit: 71/100 Needs review",
"Safety: 27/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "invergent-ai-subagent-task-worker (subagent-task-worker)",
"install_command": "npx skills add invergent-ai/surogates --skill subagent-task-worker",
"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": "invergent-ai-subagent-task-worker",
"task": "Use subagent-task-worker 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/invergent-ai-subagent-task-worker",
"api": "https://www.openagentskill.com/api/agent/skills/invergent-ai-subagent-task-worker",
"audit": "https://www.openagentskill.com/skills/invergent-ai-subagent-task-worker/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=invergent-ai-subagent-task-worker&task=Use%20subagent-task-worker%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20subagent-task-worker%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20subagent-task-worker%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/invergent-ai-subagent-task-worker/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/invergent-ai-subagent-task-worker"
}
}Listing source
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Sandbox only
Audit
71/100
Needs review
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.