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

The description discloses important behavioral details: using the config provides a permanent, non-expiring connection, while pasting gives a session-only login. It also mentions calling with no args returns a link. These go beyond the annotations, which only state idempotency and non-destructive nature. The side effect of modifying config is implied and addressed.

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 lengthy and rambling, mixing instructions, best practices, and alternatives in a single block. It lacks clear structure (e.g., bullets or steps) and could be shortened significantly while retaining key information. The phrasing 'log in in the browser' is awkward and repetitive.

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 authentication context, the description covers all necessary steps: how to obtain a token, two usage options (config vs. session), and behavior when no args are provided. It does not mention output schema, but none is defined, so that's acceptable. The description is complete enough for a user to understand the tool's functionality.

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 single parameter 'token' is well explained: providing it uses the token, omitting it returns a link. The description clarifies both usage modes, effectively covering the parameter's semantics despite the schema not having a description. This adds meaningful context beyond the raw 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?

The description clearly states the tool's purpose as authentication, explaining how to log in and obtain a token. It distinguishes itself by focusing on the token retrieval and usage, which is specific enough. However, the phrase 'MCP.AI for IDE agents' is somewhat vague and could be clearer.

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 provides instructions on how to use the tool: either add the token to the server config for permanent access or paste it for a session. It implies when to use it (authentication) but does not explicitly mention alternatives or when not to use it. The guidance is present but not comprehensive.

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