feat(dataflow): DF4 — trace() + CLI + MCP for end-to-end data flow#7
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trace(graph, entry, max_depth=6) walks the call graph + cross-layer edges and returns a DataFlow with ordered hops. Entry can be a function qualname or "METHOD /path" (for fetch-shape entry — uses match_route() from DF3). Hop construction: - args/kwargs come from incoming CALLS edge metadata (DF0) - layer = frontend (.tsx/.jsx or COMPONENT role) | db (REPO role) | backend - role propagated from node metadata - READS_FROM/WRITES_TO emitted as terminal db hops - FETCH_CALL → match_route → cross-layer transition - Cycle-safe: visited set drops back-edges - Confidence = min across hops New CLI: codegraph dataflow trace <entry> [--depth N] [--format markdown|json] New MCP tool: dataflow_trace (15 tools registered now, was 14) 15 new tests covering simple chains, cycles, max depth, layer assignment, role propagation, fetch→route transition, db hops, confidence, CLI smoke (markdown + json), MCP tool. Suite: 458 passed (was 443; +15). Stack: ruff + mypy --strict clean.
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smochan
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May 30, 2026
The `mcp:` field in `.codegraph.yml` was never read by any code path.
Sitting next to the active `register_mcp: true`, it confused users into
thinking it had to be flipped on manually.
Removed from `CodegraphConfig`. `model_config = {"extra": "ignore"}`
keeps forward-compat: existing 0.1.x configs that still carry the
field load without error.
v0.1.2 backlog item #7.
smochan
added a commit
that referenced
this pull request
May 30, 2026
The `mcp:` field in `.codegraph.yml` was never read by any code path.
Sitting next to the active `register_mcp: true`, it confused users into
thinking it had to be flipped on manually.
Removed from `CodegraphConfig`. `model_config = {"extra": "ignore"}`
keeps forward-compat: existing 0.1.x configs that still carry the
field load without error.
v0.1.2 backlog item #7.
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Walks call graph + cross-layer edges. Entry can be qualname or 'METHOD /path'. New CLI subcommand and MCP tool. 15 new tests, 458 total.