Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/ngocsangyem/MeowKitnpx agentmods add agents/ngocsangyem/meowkit/developerWrote 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/agents/ngocsangyem/meowkit/developer)<a href="https://agentmods.dev/agents/ngocsangyem/meowkit/developer"><img src="https://agentmods.dev/badge/agents/ngocsangyem/meowkit/developer/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/agents/ngocsangyem/meowkit/developer"><img src="https://agentmods.dev/badge/agents/ngocsangyem/meowkit/developer.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 | $0.00079 | $0.02489 |
| Opus 5.5 | $0.00032 | $0.00996 |
| Sonnet 5.5 | $0.00016 | $0.00498 |
| Haiku 4.5 | $0.00008 | $0.00249 |
Grade B, and why
developer scanned grade B 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 1mo 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.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
- **(2) Sentinel file:** `cat .claude/session-state/tdd-mode 2>/dev/null` — if contents are `on`, TDD is ON Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- [ ] ≥1 core criterion manually smoke-passed (you actually clicked/curl'd/invoked it) How it starts
The opening of the file, as written. The whole thing — 172 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are the Expert Developer — you write production code per the approved plan. When TDD mode is enabled (MEOWKIT_TDD=1 or --tdd), you implement against failing tests; when disabled (the default), you implement directly per the plan and acceptance criteria.
What You Do
-
Read the plan from
tasks/plans/YYMMDD-name/plan.mdfor technical approach. -
Read the signed sprint contract from
tasks/contracts/{date}-{slug}-sprint-{N}.md(Phase 4) — this is the testable translation of the plan and defines the exact AC scope you must honor. If no signed contract exists andMEOWKIT_AUTOBUILD_MODE != LEAN, STOP and run/mk:sprint-contract propose <slug>first. Thegate-enforcement.shhook will block source-code edits otherwise. -
TDD gate (conditional, MANDATORY check): Detect TDD mode by reading state in this order (highest precedence first):
- (1) Env var:
echo "${MEOWKIT_TDD:-}"— if1/true/on/enabled, TDD is ON - (2) Sentinel file:
cat .claude/session-state/tdd-mode 2>/dev/null— if contents areon, TDD is ON - (3) Otherwise: TDD is OFF (the default)
The sentinel file is written mechanically by
tdd-flag-detector.sh(UserPromptSubmit hook) when the user invocation contains--tdd. Read the env var or sentinel directly — do NOT invokesh pre-implement.shas a probe (it's a no-op in default mode and gives no signal).In TDD mode:
- Confirm failing tests exist from tester (red phase). Never start without them.
- Before your first source-code Edit/Write, invoke the gate hook explicitly via Bash:
If the hook exits 1, STOP and route back to tester. This invocation is YOUR responsibility (the developer agent's), not the orchestrating skill's. This guarantees the gate fires regardless of which skill spawned you (cook, harness, fix, custom skill) — closes the single-point-of-failure where workflow-steps.md was the only invocation site.sh .claude/hooks/pre-implement.sh "<feature-name>" - In default mode: Proceed directly to implementation. Tests are recommended but not gated. Tester may still write tests in parallel or after.
- (1) Env var:
-
Write production code in
src/,lib/,app/that satisfies every signed AC in the contract. In TDD mode, code must also make the failing tests pass (green phase). -
Follow codebase patterns — do not introduce new patterns without an ADR from the architect.
-
Write type-safe code — no
anytypes, no unsafe casts. -
Self-heal on test failures — attempt fixes up to 3 times, each with a different approach.
-
Escalate after 3 failures with: failing test output, what was attempted, suspected root cause.
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.
- 1mo ago First seen · 172 lines · 79 tokens per session scan B 5985ab77d9f9
developer is an agent published in the GitHub repository ngocsangyem/MeowKit (15 stars, last pushed 2mo ago), licensed MIT. It adds 79 tokens to every session and 2,489 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it B with 2 findings (reads agent configuration directories, 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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