A command that runs the project's type checker and fixes type errors with the smallest safe edits. A type checker finds cases where values or function inputs do not match the types expected by the code.

Use it in TypeScript, Python, or Rust projects to detect the available checker, fix errors by file, and rerun the checks after each batch. It reports modified files and any errors left unresolved.

It reduces type errors without hiding them through broad escape hatches such as disabling checks. It compares the error count before and after the changes and stops when further progress would require a larger redesign.

fix-types — Command for Claude Code by JuliusBrussee/caveman-code

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/JuliusBrussee/caveman-code

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.

README.md

[![agentmods](https://agentmods.dev/badge/commands/juliusbrussee/caveman-code/fix-types/github.svg)](https://agentmods.dev/commands/juliusbrussee/caveman-code/fix-types)

Your own site

<a href="https://agentmods.dev/commands/juliusbrussee/caveman-code/fix-types"><img src="https://agentmods.dev/badge/commands/juliusbrussee/caveman-code/fix-types/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/commands/juliusbrussee/caveman-code/fix-types"><img src="https://agentmods.dev/badge/commands/juliusbrussee/caveman-code/fix-types.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 17 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 270 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.

Model	Per session	Once invoked
Fable 5.1	$0.00017	$0.00270
Opus 5.5	$0.00007	$0.00108
Sonnet 5.5	$0.00003	$0.00054
Haiku 4.5	$0.00002	$0.00027

Measured 2mo ago against content hash 1de24be80e6e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fix-types 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 2mo 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.

packages/coding-agent/commands/fix-types.md · 33 lines

What it actually says

Fix type errors in the smallest, safest way.

Detect the type-checker:
- TypeScript projects: tsc --noEmit or tsgo -p tsconfig.json --noEmit.
- Python: mypy or pyright.
- Rust: cargo check.
Run it once over the scope ${1:-.} and capture the error list.
Group errors by file. Open the file with the most errors first, read it end-to-end, and apply minimal edits.
Re-run the type-checker after each batch. Stop when:
- All errors are gone, or
- No further error reduction is possible without a wider refactor.
Never silence errors with any, # type: ignore, @ts-ignore or equivalent unless there is no alternative; if you must, add a brief comment explaining why.

Report:

Errors before / after.
Files modified.
Any errors deliberately left and the reason.

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.

2mo ago First seen · 33 lines · 17 tokens per session scan A 1de24be80e6e

Subscribe to this mod's changes

fix-types is a command published in the GitHub repository JuliusBrussee/caveman-code (947 stars, last pushed 2mo ago), licensed MIT. It adds 17 tokens to every session and 270 once invoked, about $0.0001 per session on Opus 5.5. 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.

Debugging

fix-types next to 6 commands from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
fix-typesJuliusBrussee/caveman-code	Command	947	2mo ago	MIT	A	17	Claude Code
qa-changesOpenHands/extensions	Command	176	yesterday	MIT	A	63	Claude Code
react-nativegetsentry/toolkit	Command	957	yesterday	none	A	0	Claude Code
auditar-cascadingluanpdd/kit-mcp	Command	5	4d ago	MIT	A	54	Claude Code
http-serviceMadAppGang/magus	Command	14	yesterday	MIT	A	27	Claude Code
doctordoncheli/don-cheli-sdd	Command	59	2mo ago	Apache-2.0	A	76	Claude Code
doctorfatihkan/badi	Command	7	1mo ago	MIT	A	0	Claude Code