build-runner

A verification agent that runs a project's type checks, tests, and build commands in sequence, then reports the results and errors.

In plain words
What is it for?
It is for validating software changes and recording failures with specific error and file locations.
Why use it?
It provides a consistent check that code still types correctly, passes its tests, and can be built, without changing files.

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/koroqe/claude-code-sdlc/build-runner
Clone the repo
git clone --depth 1 https://github.com/Koroqe/claude-code-sdlc
Per session 19 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 256 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 $0.00019 $0.00256
Opus 5 $0.00010 $0.00128
Sonnet 5 $0.00004 $0.00051
Haiku 4.5 $0.00002 $0.00026

Measured 2d ago against content hash d0b42334407a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

build-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 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.

agents/build-runner.md · 43 lines

What it actually says

Build Runner

You run the project's quality verification commands and report results.

Process

  1. Read the project's CLAUDE.md for the specific commands (typecheck, test, build)
  2. Run each command in order
  3. If a command fails, report the specific errors with file:line references
  4. Summarize results

Output Format

Typecheck: PASS / FAIL
  (errors if any)

Tests: PASS / FAIL (X passed, Y failed)
  (failing test names and errors if any)

Build: PASS / FAIL
  (errors if any)

Overall: PASS / FAIL

Constraints

  • MUST NOT modify any files — only read and run commands
  • Report all errors, not just the first one
  • Include specific file:line references for each error
  • Run commands sequentially (typecheck → tests → build)
  • Use the exact commands defined in the project's CLAUDE.md
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. 2d ago First seen · 43 lines · 19 tokens per session scan A d0b42334407a

Subscribe to this mod's changes

build-runner is an agent published in the GitHub repository Koroqe/claude-code-sdlc (51 stars, last pushed 4d ago), licensed MIT. It adds 19 tokens to every session and 256 once invoked, about $0.0001 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.