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Data-System-School/agent-skills
Portable skills for coding agents — self-contained Markdown procedures that run the same under Claude Code, Codex, or any host that reads the format. Starting with investigate-codebase, which builds an evidence-backed model of an unfamiliar repository instead of a confident directory tour.
History
Review weekly changes to SKILL.md before updating. Dates mark the weeks in which we observed each version; checks apply to the recorded commits.
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investigate-codebase/SKILL.md
Week of Oct 26, 2026 · Line counts unavailable
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Heat
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Individual skills in this repository
- investigate-codebase
investigate-codebase
How it works
investigate-codebase
When your agent uses it
Build an evidence-backed working model of an existing codebase. Use when you must orient in a large or unfamiliar repository; explain architecture or a subsystem; trace a request, runtime, control, or data flow for a concrete question or bug; analyze a branch, commit, diff, or pull request for behavioral impact and blast radius; or assess AI-generated or changed code against requirements, contracts, invariants, tests, and runtime evidence. Default to read-only investigation. Do not trigger only because a coding task touches an existing repository; use when understanding or verification is the requested outcome or a substantial prerequisite.
What it loads into context
Frontmatter
147 tokensAlways available to the agent
SKILL.md
1,961 tokensWhen the skill is activated
Reference documents
2,177 tokensLoaded on request
Token counts are estimates. Scripts run separately; they are not counted as reference context.
The playbook
- Objective
- Operating contract
- Select the investigation
- Investigation loop
- Report contract
- Completion criteria
Files
SKILL.mdcore9,664 bytesSKILL.mdcore9,664 bytesagents/openai.yamlasset383 bytesassets/icon.svgasset1,738 bytesreferences/analyze-pr-impact.mddoc2,543 bytesreferences/orient-large-codebase.mddoc2,550 bytesreferences/trace-runtime-flow.mddoc2,261 bytesreferences/verify-generated-code.mddoc3,827 bytes
Read SKILL.md
# Investigate Codebase
## Objective
Build the minimum sufficient, falsifiable model needed to answer the user's
question. Prefer a thin vertical slice over an exhaustive repository summary.
Optimize for human understanding and verification, not the amount of code read.
## Operating contract
- Read all applicable repository and agent instruction files before inspecting
implementation, including nested per-directory files under whichever convention
the repository uses (for example `AGENTS.md`, `CLAUDE.md`, or `CONTRIBUTING.md`).
- Default to read-only investigation. Do not edit files, install dependencies,Skills included
- investigate-codebase
Repository facts
- License
- MIT
- Created
- Aug 19, 2026
- Last pushed
- Aug 20, 2026
- Forks
- 1
- Open issues
- 0
- Project activity
- Slowing
Before you install
Instructions onlyAutomated signals, not a guarantee
Checked Nov 6, 2026
Not fully analyzed: some files were too long, unreadable or missing. This never lowers the level.
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investigate-codebase/SKILL.md:1Analysis incomplete: Referenced executable target unavailable; not analyzed
- No broad tool permissions
- No dangerous shell commands
- 1 network referencein 1 file: investigate-codebase/assets/icon.svg:1
- No hidden or obfuscated text
- No instruction overrides
- No executable scripts
- No access to secrets
- No requests to vote in Hot
Show the signal with its line
investigate-codebase/assets/icon.svg
- Network accessline 1
<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
How the signals fit together
Facts from a static read of the files at the pinned commit. They describe what the code does, not why.
Some files could not be read; the facts below still hold.
No combined signals at this commit.
Works with
| Agent | Status | Evidence | Install to |
|---|---|---|---|
| Claude Code | Compatible | Standard SKILL.md investigate-codebase/SKILL.md | .claude/skills/<skill-name>/ |
| Codex | Compatible | Standard SKILL.md investigate-codebase/SKILL.md | .agents/skills/<skill-name>/ |
| Cursor | Compatible | Standard SKILL.md investigate-codebase/SKILL.md | .cursor/skills/<skill-name>/ |
| Gemini CLI | Compatible | Standard SKILL.md investigate-codebase/SKILL.md | .gemini/skills/<skill-name>/ |
| GitHub Copilot | Compatible | Standard SKILL.md investigate-codebase/SKILL.md | .github/skills/<skill-name>/ |
| OpenCode | Compatible | Standard SKILL.md investigate-codebase/SKILL.md | .opencode/skills/<skill-name>/ |
- Native The repository ships a manifest, folder or frontmatter field for this agent.
- Compatible A standard SKILL.md that this agent can read.
- Unknown No evidence either way.
Derived automatically from paths, manifests and frontmatter. Not tested on each agent.
