A helper that creates or repairs a repository's `.gitignore`, the file listing files Git should not track. It combines required project entries with optional templates for languages and development tools.

Use it when `.gitignore` is missing or incomplete, especially after a guard reports files that should be ignored.

It reduces the chance of committing secrets, temporary state, or local tool files, while preserving existing ignore rules.

How friedbotstudio/baseline configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to friedbotstudio/baseline. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/friedbotstudio/baseline/main/.claude/skills/gitignore/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/friedbotstudio/baseline

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/skills/friedbotstudio/baseline/gitignore/github.svg)](https://agentmods.dev/skills/friedbotstudio/baseline/gitignore)

Your own site

<a href="https://agentmods.dev/skills/friedbotstudio/baseline/gitignore"><img src="https://agentmods.dev/badge/skills/friedbotstudio/baseline/gitignore/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/skills/friedbotstudio/baseline/gitignore"><img src="https://agentmods.dev/badge/skills/friedbotstudio/baseline/gitignore.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 728 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	$0.00000	$0.00728
Opus 5.5	$0.00000	$0.00291
Sonnet 5.5	$0.00000	$0.00146
Haiku 4.5	$0.00000	$0.00073

Measured 1mo ago against content hash 548ba6e1ec1b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gitignore 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 1mo 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.

.claude/skills/gitignore/SKILL.md · 33 lines

How it starts

The opening of the file, as written. The whole thing — 33 lines — stays where its author put it; the contents beside it link to each section on GitHub.

gitignore — generate and repair .gitignore

This skill produces a correct .gitignore for the current project. It runs in main context (Article II). It never blocks a commit — enforcement is the gitignore_leak_guard hook's job; this skill repairs what the guard flags.

Source of truth

The canonical baseline must-ignore set lives at .claude/skills/gitignore/baseline-ignores.json (entries spanning secret, state, and tooling categories). Consumer-specific additions live in project.json → gitignore.extra_must_ignore. The same set is read by the install/init merge and by the gitignore_leak_guard hook, so the three never drift.

Steps

Read the baseline set from baseline-ignores.json and the consumer extras from project.json → gitignore.extra_must_ignore. These are mandatory — they MUST end up in the final .gitignore.
Optional enrichment via gitignore.io (network). When the user names stacks (or you infer them from the repo), fetch language/IDE coverage from the gitignore.io service hosted at Toptal:
- List available types: GET https://www.toptal.com/developers/gitignore/api/list
- Generate for a comma-separated list: GET https://www.toptal.com/developers/gitignore/api/<type1,type2,...> (e.g. node,macos,visualstudiocode) → plain-text .gitignore body. Use WebFetch. This is enrichment only.
Offline fallback. If the network is unreachable or the service errors, skip enrichment and write the baseline set only, then tell the user the enrichment was skipped (offline fallback). The baseline correctness never depends on the network — the fallback path is the safety net, not an error.
Merge add-only. If a .gitignore already exists, never overwrite or reorder it. Append only the lines (baseline + enrichment) that are not already present, preserving the existing content byte-for-byte. If none exists, create it from the baseline (+ enrichment).
Confirm. Report which sources contributed (baseline always; gitignore.io types if reached; consumer extras) and whether the offline fallback was used.

Read the full file on GitHub · 33 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

baseline-ignores.json 2.2 KB

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.

1mo ago First seen · 33 lines · 0 tokens per session scan A 548ba6e1ec1b

Subscribe to this mod's changes

gitignore is a skill published in the GitHub repository friedbotstudio/baseline (14 stars, last pushed 13d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 728 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.

AI Safety Git and workflow ai ai-coding ai-governance ai-security ai-tools

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