Borrowing it
Nothing to install: this file belongs to bahdotsh/indxr. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/bahdotsh/indxr/main/.cursor/skills/explore-codebase-index/SKILL.mdgit clone --depth 1 https://github.com/bahdotsh/indxrWrote 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/bahdotsh/indxr/explore-codebase-index)<a href="https://agentmods.dev/skills/bahdotsh/indxr/explore-codebase-index"><img src="https://agentmods.dev/badge/skills/bahdotsh/indxr/explore-codebase-index/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/bahdotsh/indxr/explore-codebase-index"><img src="https://agentmods.dev/badge/skills/bahdotsh/indxr/explore-codebase-index.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00067 | $0.00477 |
| Opus 5.5 | $0.00027 | $0.00191 |
| Sonnet 5.5 | $0.00013 | $0.00095 |
| Haiku 4.5 | $0.00007 | $0.00048 |
Grade A, and why
explore-codebase-index 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.
What it actually says
Explore codebase via INDEX.md
When to use
Apply this skill when exploring this repository and the user (or task) needs a structural picture: files, functions, types, classes, and imports across the project.
Instructions
-
Start with the index — Read
.cursor/INDEX.mdearly. It aggregates what would otherwise require many file opens: tree layout, per-file summaries, declarations, and import relationships (generated from the project indexer). -
Use it to route next steps — Pick files and symbols from the index, then open only those regions (e.g. via
read_source, symbol search, or the Read tool for edits). Avoid reading large unrelated areas when the index already answers “what lives where.” -
If the index looks stale — Timestamps and counts appear at the top of
INDEX.md. After substantial code changes, the maintainer may regenerate it (see project guidance such asregenerate_index/ indexer docs in-repo). If sections clearly mismatch the tree on disk, say so briefly and fall back to directory listing plus targeted reads.
Relationship to other tooling
Project rules may require indxr MCP tools for surgical queries. INDEX.md is the offline, whole-repo structural digest; MCP tools are ideal for precise symbol lookup and line-scoped reads. Use both: index for orientation and breadth, MCP (or direct reads) for depth on chosen symbols.
Examples
User: “Where is Rust query logic for TypeScript?”
- Open
.cursor/INDEX.md, find the directory tree and declaration sections forsrc/parser/queries/. - Note
typescript.rs(and related modules), then read only those files or the relevant symbols.
User: “What does the MCP server expose?”
- Scan
INDEX.mdformcp,src/mcp.rs, and linked declarations. - Drill into the named functions/types from there.
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 · 35 lines · 67 tokens per session scan A e74864b5b602
explore-codebase-index is a skill published in the GitHub repository bahdotsh/indxr (73 stars, last pushed 6mo ago), licensed MIT. It adds 67 tokens to every session and 477 once invoked, about $0.0003 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.
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