The MCP server gated tool availability on whether the server root had a
.codegraph/ index, so in a monorepo where only sub-projects are indexed the
agent saw zero tools — and couldn't reach an indexed sub-project even by
projectPath. A session started before `codegraph init` also never surfaced the
tools afterward. The Claude front-load hook had the mirror gap: it only walked
UP for an index, so it stayed silent at a monorepo root.
MCP server:
- Always expose the tool surface; when the root isn't indexed, send a
per-project instructions variant (pass projectPath) instead of the
"inactive" note. Safety comes from response SHAPE (success-shaped guidance,
never isError), not from hiding tools.
- Reword the no-default-project guidance to be per-project, not per-session,
and sharpen the projectPath schema description.
Front-load hook (UserPromptSubmit):
- Scan DOWN (bounded depth, workspace-root-gated) for indexed sub-projects and
shape the injection by topology: front-load the one the prompt names, nudge
about the rest, or list them when ambiguous.
Verified: full suite (1703 passed); a live two-package monorepo run confirms the
hook front-loads the correct sub-project with no cross-package leakage. The
front-load's net speed effect is the existing multi-file-vs-single-file
tradeoff, unchanged by this work.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Colby Mchenry
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