Summary

cross-repo-intelligence mode makes 0 CROSS_HTTP_CALLS edges between FastAPI backend and its frontend client. FastAPI extractor leaves Route.path empty. Path text lands only in Route.name / Route.qualified_name, and router mount prefix gets stripped. Matcher keys on Route.path, so it compares against nothing.

Environment

• Backend: FastAPI (@router.get(...) + include_router(prefix=...)). ~10.9k nodes, 143 Route nodes.
• Frontend: TanStack Router SPA. HTTP_CALLS.url_path populates fine (e.g. /admin/scenarios/:id).

Reproduction

1. Index FastAPI repo (mode: fast or full).
2. Index frontend repo that calls that backend. Confirm HTTP_CALLS.url_path populates.
3. Run index_repository(mode="cross-repo-intelligence", target_projects=[backend]) from frontend.

Result:

{"mode":"cross-repo-intelligence","cross_http_calls":0,"total_cross_edges":0}

Root cause

Backend Route nodes after fresh index:

MATCH (r:Route) WHERE r.file_path =~ '.*drona/scenario.*'
RETURN r.name, r.method, r.path, r.qualified_name

"/scenarios/{scenario_id}"  "GET"  ""  "__route__GET__/scenarios/{scenario_id}"
"/scenarios/{scenario_id}/draft/publish"  "POST"  ""  "__route__POST__/scenarios/{scenario_id}/draft/publish"

• r.path is "" on every FastAPI route.
• MATCH (r:Route) WHERE r.path <> '' ... returns 0 rows across the whole project.
• Path text sits in name / qualified_name only.

Two gaps

1. Route.path empty for FastAPI. Matcher key field holds nothing. This one fact makes cross-repo linking a no-op.
2. Router prefix stripped. Backend stores /scenarios. Real mounted path is /admin/scenarios. Extractor drops include_router(prefix=...). Even with path filled from name, prefix gap plus param style ({scenario_id} vs :id) breaks a plain string match.

Suggested fix

• Fill Route.path from decorator arg during FastAPI extraction.
• Resolve include_router(prefix=...) mounts, prepend them, store full external path.
• Normalize path params ({id} / :id / {id:int}) in matcher before compare.

Impact

trace_path(mode=cross_service) cannot bridge any FastAPI backend to its clients until Route.path populates. Cross-repo mode stays dead for the FastAPI plus SPA stack.