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

Annotations only declare readOnlyHint=true; the description adds real behavioral context on top: login is required, archived organizations are silently excluded from results, and capability is computed server-side so callers must not infer it from role. These are non-obvious traits that affect how results should be interpreted. It does not mention pagination, result size, or ordering, which keeps it from a 5.

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-loaded with the login requirement and the listing scope, which is good. However, the sentence about kind=alliance and alliance identifiers references a parameter the schema does not have, so that content does not earn its place here and dilutes an otherwise tight definition.

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 read-only list tool with no output schema, the description covers access requirements, filtering semantics, the capability computation caveat, and the alternative tool. The remaining gaps are return shape and pagination, which are minor given the absent output schema. The dangling 'kind' reference is the only real defect.

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 0% and the single enum has seven values, so the description must carry the load. It explains the intent of 'capability' (only show spaces where activity hosting/matching/managing is possible) and warns that the server computes it, but most enum members (introduce, pickActivities, draftFromProposal, manageActivities vs publishActivities) are never distinguished. It also discusses a 'kind' parameter that is absent from the schema, which adds confusion rather than meaning.

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 and resource ('列我当前可进入的组织/联盟空间') plus the scope restriction ('只含在册且未归档组织'), which an agent can match against the tool name. It is materially clearer than the many list_my_* siblings because it names what is being listed and what is excluded. It falls short of 5 only because of the stray 'kind=alliance' discussion of a parameter that does not exist in the schema, which muddies the core statement.

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?

Explicitly routes '组织申请中列表' to list_my_organization_memberships(scope=applications), which is exactly the sibling disambiguation an agent needs. It also states the login prerequisite and the narrow use case for the capability filter ('只列能办活动/撮合/管理的空间'). No explicit when-not-use exclusions beyond the one alternative, so 4 rather than 5.

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