Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add haabe/mycelium/plugin install myceliumWrote 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/haabe/mycelium/definition-of-done)<a href="https://agentmods.dev/skills/haabe/mycelium/definition-of-done"><img src="https://agentmods.dev/badge/skills/haabe/mycelium/definition-of-done/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/haabe/mycelium/definition-of-done"><img src="https://agentmods.dev/badge/skills/haabe/mycelium/definition-of-done.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00021 | $0.02276 |
| Opus 5 | $0.00010 | $0.01138 |
| Sonnet 5 | $0.00004 | $0.00455 |
| Haiku 4.5 | $0.00002 | $0.00228 |
Grade A, and why
definition-of-done scanned grade A with 0 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 13d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Definition of Done Skill
DoD checklist enforcement.
Completion Audit: Anti-Bias Clauses
Before checking any item below as DONE, perform a completion audit against the actual current state, not against intent or memory:
- Restate the acceptance criteria as concrete deliverables. Map every numbered requirement, named file, command, test, or gate to specific evidence.
- Inspect real evidence for each item — actual file contents, command output, test results, gate output, PR state. Not "I implemented it" — "here is the file at this path showing it."
- Verify proxies actually cover the requirement. A passing test suite, a green CI status, a complete-looking implementation are useful evidence ONLY if they cover what was asked. A test that passes but doesn't exercise the new code is not coverage. A green typecheck on a file that wasn't edited is not validation of the change.
- Treat uncertainty as not-done. If you can't verify an item with evidence, the item is NOT DONE. Do more verification or continue the work.
Do not rely on any of the following as proof of completion:
- Intent — "I meant to do X" is not "X is done"
- Partial progress — "I started X" is not "X is complete"
- Elapsed effort — "I spent time on X" is not "X works"
- Memory of earlier work — re-verify; the state may have changed
- A plausible final answer — fabricated test output, hallucinated file contents, or a confident summary that wasn't checked against reality is the canonical failure mode this skill exists to prevent
These clauses address two documented Mycelium failures: Eval Overfitting (2026-04-30 — agent encoded eval answers into documentation to "pass," gaming the proxy instead of checking the criterion) and SessionStart relay leak (2026-05-02 — agent declared turns complete while skipping protocol steps). Borrowed from OpenAI Codex /goal continuation template's completion-audit specification (logged 2026-05-03).
Checklist
Functionality
- All acceptance criteria met and demonstrable
- Happy path works end-to-end
- Edge cases handled (empty, null, max, concurrent)
- Error states handled with user-friendly messages
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.
- 13d ago First seen · 158 lines · 21 tokens per session scan A 28fe102e005d
definition-of-done is a skill published in the GitHub repository haabe/mycelium (45 stars, last pushed yesterday), licensed MIT. It adds 21 tokens to every session and 2,276 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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