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.
git clone --depth 1 https://github.com/orin-dx/agent-pluginsWrote 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/orin-dx/agent-plugins/mutator)<a href="https://agentmods.dev/agents/orin-dx/agent-plugins/mutator"><img src="https://agentmods.dev/badge/agents/orin-dx/agent-plugins/mutator/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/orin-dx/agent-plugins/mutator"><img src="https://agentmods.dev/badge/agents/orin-dx/agent-plugins/mutator.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 | $0.00042 | $0.00643 |
| Opus 5.5 | $0.00017 | $0.00257 |
| Sonnet 5.5 | $0.00008 | $0.00129 |
| Haiku 4.5 | $0.00004 | $0.00064 |
Grade A, and why
mutator 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 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.
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.
What it actually says
<load_first> For Rust workspaces: shared/references/verification/rust.md For TypeScript/JavaScript workspaces: shared/references/verification/typescript.md For Python workspaces: shared/references/verification/python.md For Go workspaces: shared/references/verification/go.md </load_first>
Key failure modes:
- Inventing a conventional tool instead of using workspace capabilities.
- Treating a tool error as unavailability.
- Reporting a meaningful survivor without a precision test.
WHEN verdict is fail, THE SYSTEM SHALL re-invoke implementer with precision_tests as additional failing tests to write and make green before proceeding.
WHEN no suitable mutation tool is available, THE SYSTEM SHALL use a safe deliberate fault when it can test the changed claim without risking shared state; otherwise it SHALL return coverage_gap with the reason.
WHEN the mutation tool is present but returns an error, THE SYSTEM SHALL set verdict to fail, record it in errors, and SHALL NOT treat it as unavailable.
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 Changed · +1 lines c33cb38c30ba
- 1mo ago Changed · -25 lines · -140 tokens per session f01b85071231
- 1mo ago Changed · +4 lines · -1 tokens per session b04c7178b890
- 1mo ago First seen · 69 lines · 183 tokens per session scan A 8968f87d787e
mutator is an agent published in the GitHub repository orin-dx/agent-plugins (1 stars, last pushed 19d ago), licensed MIT. It adds 42 tokens to every session and 643 once invoked, about $0.0002 per session on Opus 5.5. 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.
Other agents, from other repositories
quality-fixer
Specialized agent for verifying software projects and fixing quality failures within the current task scope. Use proactively after code changes or for quality, test, build, lint, format, correctness, or fix requests.
ring:test-reviewer
Test Quality Review: Reviews test coverage, edge cases, test independence, assertion quality, and test anti-patterns. Runs in parallel with other reviewers at Gate 8.
evolve-tdd-engineer
Test-first agent for the Evolve Loop. Writes failing tests that encode acceptance criteria BEFORE Builder writes any production code. RED phase is the proof of understanding. Runs on Opus (tier-1) for anti-cooperative-bias separation from Builder's Sonnet (tier-2).
quality-reviewer
Evaluates code quality (CQ1-CQ40) and test quality (Q1-Q25) on implemented code. Read-only. Enforces critical gates.
tea
Master Test Architect and Quality Advisor.
flake-hunter
Hunts and stabilizes flaky tests — the ones that pass locally but fail on CI, fail every 50th run, or fail only on Mondays. Identifies the root cause (timing, shared state, async ordering, fixture pollution, network, randomness) and proposes a deterministic fix. Never just adds retries to hide flakes. Use when CI is…