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

Annotations already declare destructive=true, readOnly=false, and idempotent=false, so the safety profile is covered. The description adds real context beyond that: login requirement, that only the caller's own pending application can be affected, and that an established alliance is not removed — an important scope-of-destruction detail.

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?

Front-loads the login requirement in brackets, then the core action, then the boundary conditions. Every clause carries distinct information with no redundancy.

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 destructive action with no output schema, the definition covers auth, valid-state preconditions, and the negative boundary (approved/rejected, established alliance). Only the exact prior tool to read state is left implicit, which is a minor 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?

Single parameter with 0% schema description coverage, so the schema alone is silent. The description adds that the id must be 'confirmed' after reading one's own state, implying where the value comes from, but provides no format/identity details beyond the schema's string constraints. Modest compensation, hence baseline 3.

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+resource (withdraw my own alliance application) and immediately constrains scope to '本人待审' (my own pending ones), which separates it from submit_alliance_application, cancel_alliance_invitation, and cancel_organization_alliance_request without needing their schemas.

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?

Gives an explicit precondition workflow ('先读本人状态并确认申请 id') and a clear exclusion ('已通过/驳回不能撤回'), so an agent knows when the call is valid and when it will fail. It stops short of naming the exact sibling tool to call first, but the conditional guidance is strong.

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