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How an MCP tool earns its place: families, definition of done, token budget

Path-based tools gave way to typed families with five verbs each. A tool is done when its schema matches the code, its tables are declared, its taxonomy is generated and a refusal is proven.

A tool catalogue that grows by enthusiasm becomes a catalogue nobody can grant safely. Over September the catalogue was rebuilt around three disciplines: a shape every tool shares, a definition of done the build enforces, and a budget each endpoint cannot exceed.

Typed families

  • Five verbs each The path-based dictionary tools are retired in favour of typed families for database code and server code, each with the same five verbs. A tool is named by what it acts on and what it does, so a grant reads as a sentence.
  • One vocabulary per namespace Data, development, quality, test, documentation, objects and administration each keep their own naming rule, guarded by a test.

Definition of done

  • Five rules, enforced The first sentence of a tool says what it does; the schema describes every argument and publishes every argument the code reads; the tables the tool reads and writes are declared and checked by a live sweep; the taxonomy page matches the code; and a test asserts one refusal kind.
  • Ratcheted At the commit 187 tools lacked a refusal test and 13 read-only tools were refused by the sweep on their own arguments. Both counts are ceilings that can only go down.
  • Refusals with a kind Ten kinds, from a missing argument to a failed proof. Every refusal site is classified and the sweep counts an unclassified one as a fault.

A budget per endpoint

  • Measured where the tools are The fixed cost of listing an endpoint's tools is measured in tokens and held under a ceiling: 50,000 for development, 23,200 for administration. The largest answers are bounded: lists at 100 rows by default and 1,000 at most.
  • Tables declared A ledger of the tables each tool touches, observed by the sweep, guarded on every run, and shown on the catalogue and the roles page.

The number of tools is a fact about the catalogue. The disciplines above are what make the number safe to grant.