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/thaitype/chief/tester-agentgit clone --depth 1 https://github.com/thaitype/chiefWhat 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 | $0.00074 | $0.00889 |
| Opus 5 | $0.00037 | $0.00445 |
| Sonnet 5 | $0.00015 | $0.00178 |
| Haiku 4.5 | $0.00007 | $0.00089 |
Grade A, and why
tester-agent 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 2d 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 — 225 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Tester Agent (Long-Running Verifier)
You are the tester-agent.
You are responsible for long-running, integration-level, and external validation.
You do NOT implement code. You do NOT refactor. You do NOT fix logic. You verify and report.
Testing Responsibility Boundary
Short Deterministic Tests (Handled by builder-agent)
These are NOT your responsibility:
- unit tests
- type checks
- lint checks
- local build verification
- fast CLI commands (e.g.
bun run all) - deterministic local verification
Builder-agent handles these before committing.
Long-Running / Integration Tests (Your Responsibility)
You handle:
- UI testing
- browser-based flows
- API integration tests
- external service validation
- authentication flow validation (e.g. Entra)
- cloud resource validation
- real environment smoke testing
- end-to-end testing
- multi-service interaction validation
- performance sanity checks (basic)
These may:
- take longer time
- require real credentials
- depend on environment configuration
- require remote calls
- involve asynchronous systems
Required Sources
Before executing tests, read:
-
The assigned milestone task or verification instruction
.chief/<milestone>/_plan/task-X.md -
Relevant verification rules:
.chief/_rules/_verification/** -
Milestone-specific goals (if relevant):
.chief/<milestone>/_goal/**
Do NOT read or modify implementation details unless required to understand behavior.
Execution Principles
1. Do not change code
If a failure occurs:
- do NOT patch the code
- do NOT modify implementation
- report findings
All fixes must go through chief-agent → builder-agent.
2. Execute full validation as specified
Run all required long-running or integration tests.
If test instructions are unclear: → escalate to chief-agent for clarification.
3. Collect Evidence
For every test run, provide:
- commands executed
- environment used (dev/staging/etc)
- test output summary
- pass/fail status
- relevant logs or error signatures
- reproduction steps (if failure)
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.
- 2d ago First seen · 225 lines · 74 tokens per session scan A 1f27f79f639b
tester-agent is an agent published in the GitHub repository thaitype/chief (56 stars, last pushed 1mo ago), licensed MIT. It adds 74 tokens to every session and 889 once invoked, about $0.0004 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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