Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/jkheadley/instar/autonomousnpx skills add JKHeadley/instar --skill autonomousgit clone --depth 1 https://github.com/JKHeadley/instarWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/jkheadley/instar/autonomous)<a href="https://agentmods.dev/skills/jkheadley/instar/autonomous"><img src="https://agentmods.dev/badge/skills/jkheadley/instar/autonomous.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00041 | $0.05649 |
| Opus 5 | $0.00020 | $0.02825 |
| Sonnet 5 | $0.00008 | $0.01130 |
| Haiku 4.5 | $0.00004 | $0.00565 |
Grade C, and why
autonomous scanned grade C with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- SCOPE_ACCRETION — scope-accretion completion discipline: register the run server-side (POST /autonomous/register) and record the returned run_id in the frontmatter; the server then holds completion while deliverable Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
| curl -s -H "Authorization: Bearer $AUTH" -H 'Content-Type: application/json' \ How it starts
The opening of the file, as written. The whole thing — 437 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Autonomous Mode (Structurally Enforced)
You are entering autonomous development mode. This mode uses a stop hook that PREVENTS you from exiting until all tasks are genuinely complete. This is not optional — the hook structurally enforces continuous work.
Step 1: Generate Stop Conditions (MANDATORY)
Before activating the stop hook, you MUST:
- Analyze the goal and break it into specific, verifiable tasks
- Present the task list to the user with clear completion criteria
- Propose a measurable
completion_conditionsynthesized from those tasks — an artifact-grounded end-state an INDEPENDENT judge can verify from what you SURFACE (a commit SHA, a file's content, a CI run id, a test-count delta). This is the PRIMARY completion mechanism. Only fall back to a self-declared promise when no verifiable condition can be expressed — and then recordcompletion_mode: promise-fallback+ a one-linepromise_fallback_reason:. - Wait for user confirmation before activating the hook
- Define the completion promise — retained as the fallback token (only TRUE when ALL tasks are done)
Example interaction:
User: /autonomous --duration=8h --goal="Complete Slack feature parity"
Agent: Here's my task breakdown for autonomous mode:
TASKS (all must be complete before I can exit):
1. [ ] Implement job-specific Slack channels
2. [ ] Build full PresenceProxy Slack integration
3. [ ] Update dashboard HTML with platform badges
4. [ ] Implement Slack Lifeline process
5. [ ] Add platform dropdown to new session UI
...
Completion promise: "ALL_TASKS_COMPLETE"
Duration: 8 hours
Emergency stop: "stop everything" via messaging
Shall I proceed? (The stop hook will prevent me from exiting until all tasks are done)
The user must confirm before the hook activates. This is the safety gate.
Step 2: Activate the Stop Hook
After user confirmation:
2a. Add the stop hook to settings.json (dynamically — it's removed when the session ends):
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 437 lines · 41 tokens per session scan C c99eb05bf6c8
autonomous is a skill published in the GitHub repository JKHeadley/instar (77 stars, last pushed 5d ago), licensed MIT. It adds 41 tokens to every session and 5,649 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it C with 2 findings (hidden instructions, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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