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.
git clone --depth 1 https://github.com/defendend/Claude-ast-index-searchWrote 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/rules/defendend/claude-ast-index-search/ast-index)<a href="https://agentmods.dev/rules/defendend/claude-ast-index-search/ast-index"><img src="https://agentmods.dev/badge/rules/defendend/claude-ast-index-search/ast-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/rules/defendend/claude-ast-index-search/ast-index"><img src="https://agentmods.dev/badge/rules/defendend/claude-ast-index-search/ast-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 | $0.00320 | $0.00320 |
| Opus 5 | $0.00160 | $0.00160 |
| Sonnet 5 | $0.00064 | $0.00064 |
| Haiku 4.5 | $0.00032 | $0.00032 |
Grade A, and why
ast-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 11d 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
ast-index Search Rules
Use ast-index first for codebase navigation tasks: finding files, symbols,
classes, usages, implementations, callers, outlines, module dependencies, and
project maps.
Before the first query in a project, run ast-index stats. If there is no
usable index yet, run ast-index rebuild from the project root. For large
repositories, prefer a scoped rebuild with --include or work from the
smallest relevant project root.
Do not run grep or broad text search after ast-index returns sufficient
structural results. Fall back to text search only for regex searches, string
literals, comments, or when ast-index returns no useful result.
Useful commands:
ast-index explore "how does X work" # one-shot: ranked source + neighbours + tests (--rwr for graph)
ast-index search "Query"
ast-index file "FileName"
ast-index symbol "SymbolName"
ast-index class "ClassName"
ast-index usages "SymbolName"
ast-index implementations "InterfaceOrBaseClass"
ast-index refs "SymbolName"
ast-index outline "path/to/File.kt"
ast-index map --limit 20
ast-index conventions
For monorepos with a trusted parent index, use ast-index --walk-up ... or
AST_INDEX_WALK_UP=1. Otherwise stay scoped to the nearest project root to
avoid mixing unrelated results.
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.
- 11d ago First seen · 40 lines · 320 tokens per session scan A df74aaf2d0fc
ast-index is a cursor rule published in the GitHub repository defendend/Claude-ast-index-search (560 stars, last pushed 5d ago), licensed MIT. It adds 320 tokens to every session, about $0.0016 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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