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.
npx skills add mhylle/claude-skills-collection --skill codebase-researchgit clone --depth 1 https://github.com/mhylle/claude-skills-collectionWrote 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.
[](https://agentmods.dev/skills/mhylle/claude-skills-collection/codebase-research)<a href="https://agentmods.dev/skills/mhylle/claude-skills-collection/codebase-research"><img src="https://agentmods.dev/badge/skills/mhylle/claude-skills-collection/codebase-research/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.
<a href="https://agentmods.dev/skills/mhylle/claude-skills-collection/codebase-research"><img src="https://agentmods.dev/badge/skills/mhylle/claude-skills-collection/codebase-research.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00072 | $0.01770 |
| Opus 5 | $0.00036 | $0.00885 |
| Sonnet 5 | $0.00014 | $0.00354 |
| Haiku 4.5 | $0.00007 | $0.00177 |
Grade A, and why
codebase-research 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 249 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Codebase Research
Overview
This skill enables comprehensive codebase research through parallel sub-agent orchestration. It decomposes research questions into focused sub-tasks, executes them in parallel for efficiency, and synthesizes findings into structured research documents.
Critical Constraint
THE ONLY JOB IS TO DOCUMENT AND EXPLAIN THE CODEBASE AS IT EXISTS TODAY.
Do NOT:
- Suggest improvements unless explicitly requested
- Perform uninvited root cause analysis
- Propose enhancements or optimizations
- Critique implementation choices or identify problems
- Recommend refactoring or architectural changes
DO:
- Describe what exists
- Explain where functionality lives
- Document how components work
- Map component interactions and dependencies
Initial Response
When this skill is invoked, respond:
"I'm ready to research the codebase. Please provide your research question or area of interest, and I'll analyze it thoroughly by exploring relevant components and connections."
Available Sub-Agents
Codebase Agents
| Agent | Purpose | When to Use |
|---|---|---|
codebase-locator |
Finds files by topic/feature | Need to locate all files related to a feature |
codebase-analyzer |
Traces implementation with file:line refs | Need to understand how code works |
codebase-pattern-finder |
Finds code patterns with examples | Need to see how patterns are implemented |
Documentation Agents
| Agent | Purpose | When to Use |
|---|---|---|
docs-locator |
Finds docs, ADRs, design documents | Need to find documentation about a topic |
docs-analyzer |
Extracts decisions and specs from docs | Need to understand documented decisions |
External Research
| Agent | Purpose | When to Use |
|---|---|---|
web-search-researcher |
Researches external documentation | Explicitly requested or need external context |
Research Workflow
Step 1: Read Mentioned Files
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.
- 9d ago First seen · 249 lines · 72 tokens per session scan A 199dd6bb490d
codebase-research is a skill published in the GitHub repository mhylle/claude-skills-collection (18 stars, last pushed 6d ago), licensed MIT. It adds 72 tokens to every session and 1,770 once invoked, about $0.0004 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.
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