Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already flag destructiveHint=true and idempotentHint=true, but the description adds the specific mechanism: the allowlist 'replaces it', which tells the agent exactly what is destroyed by a call. It also discloses the auth requirement (workspace owners only) and the null-means-all semantics, which annotations cannot express.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

A single dense sentence that front-loads the action and the resource, with the critical '(replaces it)' caveat embedded right where it matters. It is packed but has no filler; only a slight readability cost from cramming four fields into one sentence.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a destructive 5-parameter mutation with no output schema, the description covers auth, partial-update behavior, and every settable field. What remains unstated is whether the call returns the resulting access configuration or how validation failures surface, which is a minor gap given the schema already constrains types and the email cap.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is only 20% (only project_id is documented), so the description must carry the four optional fields — and it does, naming each one and clarifying that sign_in_providers accepts github/google/microsoft with null meaning all. It stops short of resolving the ambiguity between omitting allowed_emails versus passing an empty array to clear it.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb ('Change who may connect to') and resource ('a connector project') and then enumerates the four settable facets: public flag, email allowlist, sign-in providers, and password accounts. This resource scope ('connector access') is clearly distinct from the sibling access tools (get_connector_access, set_project_access, set_member_role), so an agent can route without opening any schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives the two decisive call conditions: 'Omitted fields stay' (partial-update semantics) and 'Workspace owners only' (permission prerequisite). It does not explicitly say to read current state with get_connector_access first, but the get/set pairing with the sibling is self-evident and no exclusions are needed here.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.