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

Annotations already declare destructiveHint=true and idempotentHint=true, and the description adds valuable workflow behavior: a redirect_uri is returned, it must be registered as a callback URI, and each account must be reconnected. It does not disclose what the destructive hint actually destroys (e.g. overwriting previously stored keys), which is a remaining gap.

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 tight sentences, front-loaded with the core action, followed by the billing benefit and the required post-steps. Every sentence earns its place with no filler.

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?

With no output schema, the description compensates by explaining the returned redirect_uri and the exact next steps the user must take. An agent has everything needed to invoke the tool and instruct the user correctly.

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 100%, so client_id, client_secret and label are already documented in the schema. The description adds context about where the credentials come from and their effect on billing, but no additional per-parameter syntax or format detail.

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 precise verb+resource: registering the user's OWN X developer app so their accounts post against their own API credits. This clearly differentiates it from siblings like chirpie_connect_x (account connection) and chirpie_get_x_keys_status (status check).

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?

Explains the context for using it (own app, own credits, no surcharge) and names the follow-up alternative chirpie_connect_x that must be called afterward. It does not explicitly state when NOT to use it (e.g. if the user is happy with Chirpie's credits), but the selection context is clear.

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