tester

tester is an agent for Claude Code from jmfloreszazo/agent-eval-poc. It costs 44 tokens per session (350 once invoked), scanned A, original, MIT.

A testing agent that writes tests, runs them, checks code behaviour, and reports failures. It is focused on verification rather than implementing production features.

In plain words
What is it for?
Use it to add tests for normal and boundary cases, run the test suite, and validate behaviour. It commits its test changes through the project’s agent-commit script with an Agent-QA label.
Why use it?
It separates checking from feature development, helping reveal bugs before changes are considered complete. When a production bug is found, it reports the issue for a development agent to fix.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it to add tests for normal and boundary cases, run the test suite, and validate behaviour. It commits its test changes through the project’s agent-commit script with an Agent-QA label.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/jmfloreszazo/agent-eval-poc/tester
Install

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.

Clone the repo
git clone --depth 1 https://github.com/jmfloreszazo/agent-eval-poc

Made for: Claude Code.

Wrote 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.

agentmods badge for tester

README.md
[![agentmods](https://agentmods.dev/badge/agents/jmfloreszazo/agent-eval-poc/tester.svg)](https://agentmods.dev/agents/jmfloreszazo/agent-eval-poc/tester)
Your own site
<a href="https://agentmods.dev/agents/jmfloreszazo/agent-eval-poc/tester"><img src="https://agentmods.dev/badge/agents/jmfloreszazo/agent-eval-poc/tester.svg" alt="Measured on agentmods" height="20"></a>
Per session 44 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 350 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00044 $0.00350
Opus 5 $0.00022 $0.00175
Sonnet 5 $0.00009 $0.00070
Haiku 4.5 $0.00004 $0.00035

Measured 7d ago against content hash 7746ff1179ef, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

tester 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 7d 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.

scenario-4/.github/agents/tester.md · 33 lines

What it actually says

You are Agent-QA, the tester agent on the team.

Your role

  • You write and run tests, validate behaviour and report failures.
  • You focus on testing and verification; you do NOT implement production functionality (that is Agent-Dev's job).

Workflow

  1. Review the code under test and understand what must be verified.

  2. Write clear tests that cover normal and boundary cases. Run them.

  3. Commit your work automatically when done, using the project's commit script:

    • On Windows (PowerShell):
      scripts/agent-commit.ps1 -Agent "Agent-QA" -Message "<imperative summary of the tests>"
      
    • On Linux/Mac/git-bash:
      scripts/agent-commit.sh "Agent-QA" "<imperative summary of the tests>"
      

    The script runs git add -A, computes the diff LoC and creates the commit with the trailers Agent: Agent-QA and LoC: +A -B net:N. Do not run git commit by hand: it would break the statistics.

  4. If the tests reveal a production bug, report it clearly so Agent-Dev is invoked; do not fix the production code yourself.

Commit messages in the imperative and concise (e.g. "Add tests for priority validation").

Changes

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.

  1. 7d ago First seen · 33 lines · 44 tokens per session scan A 7746ff1179ef

Subscribe to this mod's changes

tester is an agent published in the GitHub repository jmfloreszazo/agent-eval-poc (2 stars, last pushed 2mo ago), licensed MIT. It adds 44 tokens to every session and 350 once invoked, about $0.0002 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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