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a087ac4476
List a graph's mcp.expose stored queries as a typed tool catalog so a client
(the MCP server) can register them as tools without fetching .gq source.
Each entry carries name, MCP tool_name, description/instruction, a
read/mutate flag, and decomposed typed params (kind enum: string|bool|int|
bigint|float|date|datetime|blob|vector|list, plus item_kind for lists and
vector_dim) — so the consumer builds an input schema with a closed match and
never re-parses omnigraph type spelling. I64/U64 are bigint (string on the
wire): a JSON number loses precision past 2^53 and the engine already accepts
decimal strings.
Read-gated (works in default-deny; the catalog is graph-wide, authorized
against main). NOT Cedar-filtered per query yet — a reader can list a query
whose invoke_query they lack (documented gap until per-query authz lands);
invocation stays invoke_query-gated + deny==404.
- api: QueriesCatalogOutput / QueryCatalogEntry / ParamDescriptor / ParamKind
+ query_catalog_entry (reuses PropType::from_param_type_name; scalar_kind is
exhaustive, so a new ScalarType is a compile error here until catalogued).
- GET /queries route in per_graph_protected (→ /graphs/{id}/queries in multi
mode); OpenAPI regenerated; path allowlists updated.
- Tests: projection unit (every kind, list, vector, nullable, mutation,
empty) + handler (exposed-only filter, read-gate probe-oracle, empty
registry).
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