build-fix

A command that runs a project's build, groups its errors by likely root cause, and fixes related errors together. It detects the build command from common project files such as package.json, Makefile, or pyproject.toml.

In plain words
What is it for?
Use it to repair TypeScript checks, incremental builds, affected packages, or full builds, while reporting fixed errors, remaining errors, and any new errors.
Why use it?
One changed interface, renamed symbol, or missing dependency can create many follow-up errors. Grouping them helps avoid fixing each symptom separately and checks progress quickly.

Command

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 commands/cloudnative-co/claude-code-starter-kit/build-fix
Clone the repo
git clone --depth 1 https://github.com/cloudnative-co/claude-code-starter-kit
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 196 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 $0.00000 $0.00196
Opus 5 $0.00000 $0.00098
Sonnet 5 $0.00000 $0.00039
Haiku 4.5 $0.00000 $0.00020

Measured 2d ago against content hash ae7bbc4f311e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

build-fix 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.

commands/build-fix.md · 27 lines

What it actually says

Build and Fix

Fix build errors by root cause, in batches:

  1. Detect the project's build command (package.json scripts, Makefile, pyproject.toml, etc.) and run it.

  2. Parse error output and group errors by root cause:

    • A changed type/interface, a renamed symbol, or a missing dependency often explains many downstream errors at once.
  3. Fix related errors as a batch. After each batch, re-check with the fastest available verification (e.g. tsc --noEmit, incremental build, affected-package build) instead of a full rebuild.

  4. Run the full build once at the end to confirm.

  5. Stop if:

    • The error count is increasing, or fixes are going in circles
    • Same error persists after 3 attempts
    • User requests pause
  6. Show summary:

    • Errors fixed
    • Errors remaining
    • New errors introduced
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 · 27 lines · 0 tokens per session scan A ae7bbc4f311e

Subscribe to this mod's changes

build-fix is a command published in the GitHub repository cloudnative-co/claude-code-starter-kit (147 stars, last pushed 8d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 196 tokens. 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.