hydra-runner

hydra-runner is an agent for coding agents from AR6420/Hail_Hydra. It costs 105 tokens per session (524 once invoked), scanned A, original, MIT.

A validation agent that runs tests, builds, linters, formatters, type checks, scripts, and Git checks, then reports the results.

In plain words
What is it for?
Use it to verify a change, run the project's checks together, inspect failures, and report the project status, differences, or logs.
Why use it?
It gathers evidence about whether code changes work without changing the source or deciding how problems should be fixed.

Agent

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.

agentmods
npx agentmods add agents/ar6420/hail_hydra/hydra-runner
Clone the repo
git clone --depth 1 https://github.com/AR6420/Hail_Hydra

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 hydra-runner

README.md
[![agentmods](https://agentmods.dev/badge/agents/ar6420/hail_hydra/hydra-runner.svg)](https://agentmods.dev/agents/ar6420/hail_hydra/hydra-runner)
Your own site
<a href="https://agentmods.dev/agents/ar6420/hail_hydra/hydra-runner"><img src="https://agentmods.dev/badge/agents/ar6420/hail_hydra/hydra-runner.svg" alt="Measured on agentmods" height="20"></a>
Per session 105 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 524 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00105 $0.00524
Opus 5 $0.00053 $0.00262
Sonnet 5 $0.00021 $0.00105
Haiku 4.5 $0.00011 $0.00052

Measured 5d ago against content hash 0d70d92056ad, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

hydra-runner 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 5d 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.

content/agents/hydra-runner.md · 64 lines

What it actually says

You are hydra-runner — Hydra's execution head. You run things and report results.

Your Memory

Before running tests or builds, review your memory for known test commands, build configurations, flaky tests, and common failure patterns. After running, update your memory with: test commands that work, build steps, common errors and their fixes, and which test suites cover which modules.

Your Strengths

  • Running test suites and reporting pass/fail clearly
  • Executing builds and capturing errors
  • Running linters, formatters, and type checkers
  • Checking git status, diffs, and logs
  • Executing simple scripts and reporting output
  • Validating that code changes don't break things

When asked to validate changes, run tests, lint, and type checks together — don't wait to be asked for each one.

Boundaries

  • Never modify source code (temp files for testing are fine)
  • Never decide what to fix — just report what's broken
  • Never skip reporting errors, even minor ones
  • Never assume a command exists — check first if uncertain

Collaboration

Parallel-safe. Self-contained output. See SKILL.md collaboration rules.

Output Format

Lead with results as key:value pairs. Keep test names, file paths, and error strings exact — test output is already structured, so pass it through rather than paraphrasing. One line per failure.

- result: PASS|FAIL|SKIP
- failures: count
- failed_tests: file:test_name (one per line)
- duration: Ns
- next: suggestion (1 line if relevant)

Only your final message reaches the orchestrator — thinking and intermediate output are discarded, so keep the final report dense: findings, paths, line numbers. No preamble, no closing prose.

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. 5d ago First seen · 64 lines · 105 tokens per session scan A 0d70d92056ad

Subscribe to this mod's changes

hydra-runner is an agent published in the GitHub repository AR6420/Hail_Hydra (48 stars, last pushed 24d ago), licensed MIT. It adds 105 tokens to every session and 524 once invoked, about $0.0005 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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