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

Annotations indicate idempotentHint=true, readOnlyHint=false, destructiveHint=false. The description adds that the config-header approach gives a 'permanent, non-expiring connection' while pasting a token is 'session-only', and that no-args returns a link. This discloses side-effect and persistence behavior beyond what annotations convey. It doesn't contradict too few details to impact the 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?

The description is a single run-on sentence with multiple instructions and a trailing colon, making it less scannable than ideal. It packs several ideas (IDE mention, browser flow, config path, session path, call syntax). It is fairly compact but could be restructured into bullet points or shorter sentences for better readability. Still, it is not bloated enough to drop below a 3.

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 an authentication tool with no output schema and basic parameters, the description covers both authentication modes, explains the session vs permanent distinction, and gives the exact invocation contract. It omits details like error handling or logout procedures, but such information may be outside the tool's current scope. Given the tool's simplicity, this is reasonably 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?

With 0% schema coverage and one optional parameter, the description fully explains 'token': 'call with { token: "<jwt>" } after the user pastes' and distinguishes the no-args case to obtain the login link. This compensates for the schema's silent field, adding meaningful semantics. A small deduction for not elaborating the token's format JWT can be inferred.

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 handles authentication ('log in in the browser, copy the access token') and provides two distinct usage modes (permanent via config header or session-only via token). While the verb+object are clear, it slightly obscures purpose by mixing instructions for IDE agents with end-user workflow. It does not explicitly contrast with the sibling 'connect' tool, but the auth role is unmistakable.

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 explicitly offers alternatives: 'Best: add it to this server's config ...' versus 'Or paste it here for a session-only login', and specifies exact call patterns: 'call with { token: "<jwt>" } ... or with no args to get the link.' This gives an agent direct guidance on when to use which approach, meeting the rubric's 'when/when-not/alternatives' at the highest level.

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