# Signals Reachability API Contract (draft placeholder)

**Status:** TODO · awaiting Signals Guild

## Scope
- `/signals/callgraphs`, `/signals/facts`, reachability scoring overlays feeding UI/Web.
- Deterministic fixtures for SIG-26 chain (columns/badges, call paths, timelines, overlays, coverage).

## Needed from owners
- OpenAPI/JSON schema for callgraphs and facts (request/response, pagination, ETags).
- Reachability score model, states, and filtering parameters.
- Fixture bundle (JSON/NDJSON) with checksums and performance budgets (target FPS/node caps).

## TODO
- Replace with ratified contract and fixtures; record schema hash/date; link from Web V and UI III logs.