Measured winner from the DGX-Spark bake-off (toolsim.py, 145-tool catalog): a
curated favourite/<tool> shortlist + the full all/<server>/<tool> catalog + a
load-bearing "prefer favourite/ first" instruction nearly halved wander (37→20)
and 2.5x'd first-pick (2→5/8) vs a flat catalog. The instruction is load-bearing;
enriching descriptions did not help.
- New mcplocal plugin `favourite-index.ts`: composes AFTER gate (no-ops while
gated), reshapes the ungated upstream catalog into favourite/ + all/, injects
the instruction (onInitialize), and rewrites presented names back to canonical
server/tool in onToolCallBefore so normal routing + content-pipeline still run.
Gate/agent virtual tools pass through untouched; favourites are upstream-only.
- compose.ts: onInitialize now concatenates plugin instructions (was first-non-null)
so favindex can contribute its banner alongside the gate's.
- Per-project config `Project.favouriteIndex` {enabled, tools[], maxFavourites};
surfaced to the proxy via discovery; wired at project-mcp-endpoint when enabled.
- Usage derivation: mcpd tool-usage ranking over tool_call_trace events
(normalizing presented names → canonical), GET /api/v1/audit/tool-usage, and
`mcpctl favourites suggest|list`.
- CLI: `create project` gains --favourite/--favourite-index/--max-favourites;
favouriteIndex round-trips through get -o yaml | apply -f. Completions regenerated.
- Tests: plugin unit (presentation, rewrite routing, gated no-op, collisions),
compose merge, canonicalizeToolName, buildFavouriteIndex, + a live smoke test.
- Docs: docs/tool-presentation.md.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
