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

The annotations already mark the operation as idempotent and non-destructive, and the description adds context about the 'inert' plan and the browser sign-in URL. This goes beyond the annotations by clarifying that no immediate action is taken on GitHub/Slack, which is useful behavioral detail.

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 description is a single, well-structured sentence with no filler. It front-loads the core action and result, making it instantly scannable for an agent.

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?

Given the tool's complexity (6 parameters) and the absence of an output schema, the description adequately covers the key return value (one URL) and the inert nature of the setup. It doesn't explain downstream steps or how the plan is stored, but sibling tools and annotations fill these gaps, making it sufficiently complete.

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?

The description provides no parameter information, and with schema coverage at only 50%, parameters like 'preset', 'idempotencyKey', and 'reviewerMentions' lack descriptions in both the schema and the tool description. The enums and defaults help slightly, but the agent gets no guidance on how to choose appropriate values.

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 clearly states the tool creates an inert GitHub-to-Slack setup plan and returns a browser sign-in URL. This distinguishes it from siblings like apply_review_router_setup and preview_review_router_setup by focusing on the initial setup step.

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 implies use for initiating setup via the word 'create' and 'inert,' but it doesn't explicitly explain when to prefer this over apply or get status. The context is clear enough for an agent to infer the intended workflow, though no direct alternatives are named.

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