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

Goes beyond the annotations by disclosing optimistic-concurrency behavior (expected version from setup.status), the required audit trail (reason), and critically that no message is sent. That is valuable context for a mutation tool whose annotations only flag non-read-only/open-world. It does not explain what happens on a version mismatch or what permissions are required.

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?

Three short sentences with the core action and scope front-loaded, followed by the two most decision-relevant caveats. Minor awkwardness in the 'teammates.setup.status and a reason.setup.status' phrasing keeps it from a 5, but nothing is wasted.

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 6-parameter mutation with no output schema but solid annotations, the description covers the concurrency contract, the reason requirement, and the scope of effect. It lacks failure/error behavior and permission prerequisites, which would push it to a 5.

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 67%, and the description compensates by explaining where expected_version and channel come from (teammates.setup.status) and why reason is required. The allowed and idempotency_key semantics are left to the schema, so it does not fully close the gap, but it adds real meaning beyond the structured fields.

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 pair ('allow or stop') and a precisely scoped resource ('approved agent replies in one vendor Slack channel'), which is clearly distinct from siblings like summer_slack_channels_describe or summer_slack_channels_list. It stops short of naming an alternative tool or contrasting with the identity/sender update siblings, but the action itself is unambiguous.

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?

'Each reply still needs a person to approve its exact text. Sends no message.' sets clear expectations about what this toggle does and does not do, implicitly excluding send/approve workflows. It does not explicitly name a sibling alternative or state conditions for choosing allowed=true vs false beyond the obvious toggle semantics.

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