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

Annotations already declare the safety profile (readOnlyHint=false, idempotentHint=true, destructiveHint=false, openWorldHint=false), so the description need only supplement. It adds the token-source requirement, but does not say what happens after unsubscribing or whether the token is invalidated, which would have earned a higher score.

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 short sentence with the action front-loaded and the token dependency attached; no filler, nothing 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 one-parameter, no-output-schema tool whose annotations cover safety and idempotency, the description supplies the one piece an agent truly needs (token provenance). It stops short of describing post-unsubscribe state, which is a minor but real gap.

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 0%, so the description must carry the one parameter's meaning. Saying the token comes from subscribe_updates tells the agent exactly where to obtain it, which is the key semantic for this parameter and compensates well for the undocumented schema.

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 ('Stop update notifications') and explicitly ties itself to its counterpart sibling, subscribe_updates, making the subscribe/unsubscribe pair unambiguous without opening either 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?

The token's origin ('from subscribe_updates') gives an implicit prerequisite and usage context, but there is no explicit when-to-use/when-not-to-use guidance or mention of alternatives among siblings such as check_reply or send_message.

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