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

Annotations declare non-readonly, non-destructive, non-idempotent, closed-world, but the description adds genuinely useful side-effect context: 'It grants no access and makes no decision' and 'Requesting review does not approve or publish.' It also discloses the stable requestId dedup pattern per action, which is not derivable from annotations. It still does not say whether team members are notified or what the call returns, so not a 5.

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?

The purpose and action list are front-loaded, followed by caveats and a pointer to the workflow guide resource, which is the right ordering. Sentences are dense but each carries payload or safety information. The adjacent 'grants no access / makes no decision' and 'does not approve or publish' lines are slightly redundant.

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 2-parameter tool with an opaque nested payload and no output schema, the description supplies the per-action parameter contract that the schema cannot express, which is the critical missing piece. Remaining gaps are minor: no return-shape mention, no coverage of cursor/reviewHash, and no statement of whether reviewers are notified.

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 coverage is 50% and the payload is an opaque additionalProperties:{} object, so the schema carries little meaning on its own. The description compensates well by enumerating per-action keys (campaignId/expectedRevision, flowId/expectedRevision, definition, reviewId/text, assigneeUid/dueAtMs/expectedAssignmentRevision). It omits the schema-mentioned 'cursor' and 'reviewHash', so it does not fully close the gap.

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?

The description names three concrete operations (requestReview, commentReview, assignReview) against concrete resources (campaign, journey, experiment), so an agent knows this tool manages the email-review/approval workflow rather than editing content. The name 'edit_email_review' is slightly misleading about the intent, but the body text corrects that. It does not explicitly contrast itself with siblings like manage_email_team or inspect_email_team.

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?

Usage is implied through the per-action breakdown (which keys each action requires), giving an agent enough to pick the right action value. However, there is no when-to-use guidance relative to sibling tools such as inspect_email_team or manage_email_team, and no stated preconditions or exclusions. Minimum viable rather than explicit routing.

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