Tool tests should not load full channel or plugin runtimes for static tool descriptions.

• Message-tool discovery should flow through shared discovery helpers and lightweight channel artifacts before falling back to a full channel plugin load.
• Channel-specific tool schemas, action lists, and static capabilities belong in plugin-owned helpers that are reused by both the full plugin and the lightweight artifact.
• Do not add direct bundled-plugin imports to agent tool tests for schema or capability assertions. If the production path needs the same data, promote a small public artifact instead.
• If a single assertion starts paying multi-second import/setup cost, split the static descriptor path from runtime execution instead of adding more mocks around the broad import.

• For src/agents/tools/*.test.ts performance work, compare targeted file runtime with pnpm test <file> before/after.
• Run pnpm build when adding or changing bundled plugin artifacts.