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s2ar Symbol Listing (File Skeleton)
x402
s2ar Symbol Listing (File Skeleton) is a paid API for AI agents from api.s2ar.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-10).
Returns a structural skeleton of a source file from a GitHub/GitLab/Codeberg repo — every function, type, and method with their line ranges but without body code.
Price / call$0.005
Success—
StatusUnknown
How this service works
File skeleton from a GitHub repo — every function, type and method with line ranges, no bodies. GET ?repo=&file=
Output
A structured skeleton of the specified source file listing every function, type, class, and method definition with their start and end line ranges, but without body/implementation code. Useful for understanding file layout and navigating to specific symbols.
Example use cases
Code review prep for large file
“Before I start reviewing the PR, show me a skeleton of `compiler/codegen.go` in `golang/go` on the `master` branch — just the function and type signatures with line numbers so I know what's in there.”
AI agent indexing repo structure
“List all the symbols defined in `src/index.ts` in `microsoft/TypeScript` — functions, types, interfaces, everything — with their line ranges so I can decide which ones to fetch in full.”
Onboarding to unfamiliar codebase
“I'm trying to understand the `requests/sessions.py` file in the `psf/requests` repo. Can you show me all the classes and methods defined there with their line numbers, but skip the actual implementation?”
Technical details
Endpoint
GEThttps://api.s2ar.dev/x402/v1/sym/ls?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a high-level structural overview of a source file before fetching individual symbol bodies. It is ideal for code navigation, pre-indexing a file before targeted symbol lookups, or understanding a large file's layout without incurring the cost of downloading full implementations. Prefer this over full-file fetch when token budget is a concern, and over semantic or name-based search when you want a complete inventory of all symbols in a specific file.
Side effects
- Repository not found or is private — returns an error indicating the repo is inaccessible
- File path does not exist in the repository at the given ref — returns a not-found error
- Ref (branch/tag/commit) does not exist — returns a reference resolution error
- File is not a recognized source code format — may return empty or partial results
- Rate limits or payment failure — returns a 402 or rate-limit error
- Malformed repo identifier — returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
Reviews
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