get_activity_messages

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

With no annotations provided, the description carries the transparency burden. It conveys a read-only 'Get' operation and explains API key fallback behavior, which is useful. However, it does not disclose error behavior, rate limits, or what happens if the activity_id is invalid.

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 concise and well-structured, with a clear first sentence followed by an Args list. Minor redundancy like repeating 'Intervals.icu' in both the summary and arg explanations does not significantly harm readability.

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?

Given the low parameter count, no nested objects, and the presence of an output schema, the description covers the essential invocation details: required ID and auth handling. It lacks explicit alternative routing and error-condition context, but is otherwise sufficient for a simple read tool.

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%, so the description must compensate, and it does. It explains that activity_id is the Intervals.icu activity ID and that api_key is optional, falling back to API_KEY from .env. This adds meaningful semantic context beyond the bare schema.

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 verb 'Get' and the resource 'messages (notes/comments) for a specific activity.' It effectively differentiates from siblings like get_activity_details or get_activity_raw by specifying the message resource, though it does not explicitly name alternative tools.

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 implies when to use the tool: when you need messages/comments for a specific activity. However, it provides no explicit guidance on when not to use it or which sibling alternatives (e.g., add_activity_message, get_activity_details) would be more appropriate for related needs.

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