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

Annotations already declare destructiveHint=true, readOnlyHint=false, and idempotentHint=false. The description adds genuinely new context beyond that: the access grant is organization-scoped rather than per-user, and passing null removes team access. It stops short of describing the effect of a stale expectedAclVersion or whether removal affects other members.

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 front-loaded sentence with no filler; the removal case is appended compactly rather than in a separate clause-heavy 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?

The tool is a destructive ACL mutation with four required parameters and no output explanation needed (output schema exists). The description covers the role semantics but omits any hint about optimistic-concurrency failure behavior and the blast radius of removing team access, which an agent needs before calling a destructive sibling.

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 25%: idempotencyKey is richly documented in the schema, but role, sheetId, and expectedAclVersion have no schema descriptions. The description supplies the semantics of role=null (removal), which the schema does not, but leaves the concurrency meaning of expectedAclVersion unexplained. Partial compensation, so baseline 3.

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 and resource ('Set viewer/editor access for the current organization') plus the removal case, so the operation is unambiguous. It does not, however, distinguish itself from close siblings such as sheets_update_user_access, sheets_remove_user_access, or sheets_share_with_email.

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?

The description explains what the role values mean (including null for removal) but gives no guidance on when to pick this tool over the user-level access siblings, nor any prerequisite about expectedAclVersion being required. Usage is left entirely to inference.

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