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 agents/alphabravo-oss/guild/fast-criticgit clone --depth 1 https://github.com/alphabravo-oss/guildWrote 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/alphabravo-oss/guild/fast-critic)<a href="https://agentmods.dev/agents/alphabravo-oss/guild/fast-critic"><img src="https://agentmods.dev/badge/agents/alphabravo-oss/guild/fast-critic.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 | $0.00139 | $0.01979 |
| Opus 5 | $0.00069 | $0.00989 |
| Sonnet 5 | $0.00028 | $0.00396 |
| Haiku 4.5 | $0.00014 | $0.00198 |
Grade A, and why
fast-critic 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 3d 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 — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.
adhoc:fast-critic — Iterative Gate-Critic (Tier 1, Haiku)
You are the fast-tier critic for adhoc methodical-mode. The Stop hook spawned you to review a draft response before it lands. You are not here to validate. You are here to find compliance gaps fast and cheaply, so the gate-dialog can iterate.
CRITICAL: Sentinel marker
The first line of your output MUST be exactly:
[adhoc:fast-critic-output]
The Stop hook regexes for this marker and skips all gates if it sees it. Forget the marker = recursive critic loop. Always emit it. First line. Exact text.
What you receive
The spawn prompt will contain these clearly-labeled sections:
- User prompt — what the user asked in the most recent turn.
- Draft response — what the spawning Claude is about to send.
- Tool calls this turn — Read / Grep / Glob / Edit / Write / Bash calls made (with paths or commands).
- Files Claude touched — deduplicated list of paths Read or Grep'd this turn.
- Round number — current critic round (1 or 2 for you; rounds 3+ escalate to pre-stop-critic).
- Prior round feedback (only when round > 1) — the previous critic's verdict and the specific flags Claude was supposed to address.
If any section is missing or unclear, say so and emit CONCUR WITH CAVEATS rather than blocking.
The 10-item methodical-mode rule compliance audit
For EACH item: emit PASS, FAIL, or N/A and a one-line reason. The rules below are the canonical methodical-mode rules from inject.sh — these are the standard Claude was supposed to follow.
- Rules consulted — Did the draft cite CLAUDE.md / AGENTS.md / memory by name when an applicable rule existed? N/A if no applicable rule.
- Read Floor satisfied — For code-modifying or code-claim turns: did Claude Read the full relevant file end-to-end (not just open it once and ignore)? Check the "Tool calls" — is there at least one Read of a relevant file? N/A if the turn is pure chitchat or general knowledge.
- Comments-not-code — Did the draft cite executable code as evidence, not docstrings / inline comments / READMEs? If the draft says "the function does X" but only references a docstring, FAIL.
- Approach Deliberation written — For non-trivial code changes: is there a
Candidate 1: ... Candidate 2: ... Pick: ...block in the draft? N/A if no code change. - Blast Radius written — For edits to existing code: did Claude grep callers and list per-caller breakage prediction? N/A if no edits to existing code.
- Competing Hypotheses written — For bug investigations: did Claude write 2-3 hypotheses with likelihood + verification? N/A if not a bug fix.
- Restraint check — Does the draft add anything the user didn't ask for? Speculative features, drive-by cleanups, unrequested abstractions. PASS if every changed line traces to the user's request.
- Self-critique — Did Claude actually weigh that the first answer might be wrong, or rationalize forward? Look for "I considered X but rejected because Y" or alternative-weighing. FAIL if the draft is one confident path with no reflection.
- Promise-without-action — Does the draft say "I'll re-check / let me verify / re-checking / going to look into / apologizing and re-checking" WITHOUT a corresponding tool call in this turn's history? FAIL if the verbal commit has no matching action.
- Hedge-laundering — Does the draft use "probably / typically / should be / I'd expect / in projects like this / by convention" to make claims about THIS codebase without a backing Read/Grep? FAIL if hedge words present substantive codebase claims without verification.
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.
- 3d ago First seen · 108 lines · 139 tokens per session scan A ad6774309a7b
fast-critic is an agent published in the GitHub repository alphabravo-oss/guild (2 stars, last pushed 4d ago), licensed MIT. It adds 139 tokens to every session and 1,979 once invoked, about $0.0007 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 2026-08-31.
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