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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and non-destructive behavior. The description adds useful behavioral context by specifying the supported filter dimensions, cursor pagination, and the upcoming-only option. No contradictions or hidden side effects are present.

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, front-loaded with the core purpose, and organized with a clear 'when to use' section. Every sentence carries functional value, and the structure makes it easy to parse quickly.

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 read-only list tool with well-documented schema parameters and clear usage triggers, the definition is largely complete. It covers filtering, pagination, and user-intent mapping. The lack of an output schema is not compensated by a description of the return shape, but this is a minor gap given the list-query nature and existing annotations.

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 schema already describes all 5 parameters at 100% coverage. The description adds meaningful usage guidance beyond the schema, notably that COMPETITION should be paired with city, and that upcomingOnly=true is the common expectation. This elevates it above the 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?

The description clearly states the tool queries an activity list, enumerates the content categories (线上/线下聚会、讲座、demo day、内测招募、COMPETITION), and explains available filters. It does not explicitly differentiate from sibling list tools like list_my_activities, but the plural list scope and COMPETITION/city focus make its purpose reasonably distinct.

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 【何时用】 section gives concrete user intents that should trigger this tool, such as '最近有什么活动' and '上海有什么创业大赛/机会', and recommends upcomingOnly=true for most cases. It lacks explicit exclusions or references to alternative sibling tools, but the provided triggers are actionable and context-rich.

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