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

Annotations already disclose destructiveHint, idempotentHint=false, and openWorldHint, so the bar is lower. The description adds valuable non-obvious behavior: changing requiredGrants may leave existing joined organizations lacking current required items, and this call will not grant those authorizations for them.

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 compact and front-loaded with the permission prerequisite, followed by the process and the critical side-effect warning. Every sentence earns its place, though the middle sentence is somewhat dense.

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 destructive mutation tool with no output schema and partial schema descriptions, the description covers login/permission requirements, a mandatory read-before-write step, and the key side effect of grant changes. It does not describe return values or rate limits, but is otherwise sufficiently complete for correct invocation.

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 only 25% (only requiredGrants is documented). The description mentions requiredGrants and '介绍' but does not clarify the distinction between joinIntro and description, nor explain allianceId beyond it being obvious. It partially compensates but leaves gaps for three of four parameters.

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 states a clear verb (修改/modify) and the resource scope (联盟、介绍、必选授权 – alliance, introduction, required grants), and the title confirms it modifies alliance intro and join conditions. However, it does not explicitly differentiate itself from sibling tools like update_alliance_organization_grants or update_organization_alliance_grants.

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?

It gives concrete prerequisites: login required, manage permission on the alliance, and 'first read the workbench; confirm alliance, introduction, and complete required grants and their impact before modifying.' This is clear context for when to use it, though it names no explicit alternative tool or when-not condition.

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