get-timeline-posts

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

With no annotations provided, the description carries the burden of behavioral disclosure. 'Fetch' implies a read-only operation, and 'reverse chronological order' explains the ordering behavior. However, it does not mention authentication requirements, pagination, rate limits, or the exact response structure, leaving gaps for an agent assessing side effects and usage constraints.

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 a single, well-structured sentence that is immediately informative. It avoids fluff and provides the essential information (resource and content) in a clear, front-loaded manner.

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 tool's simplicity and complete schema coverage, the description is nearly sufficient. It explains what the timeline contains and the ordering. However, because there is no output schema, a brief note about the return format (e.g., a list of post objects) would make it fully complete for an agent.

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 100%, so the input schema already thoroughly explains both parameters ('count' as number of posts or hours, and 'type' as posts/hours). The description adds no additional parameter semantics, which is acceptable because the schema handles the heavy lifting.

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 uses a specific verb 'Fetch' and clearly identifies the resource as 'your home timeline from Bluesky'. It further distinguishes this from sibling tools by explaining it contains posts from followed people in reverse chronological order, which separates it from get-user-posts, get-feed-posts, and get-list-posts.

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 provides clear context about what the tool does (home timeline of followed users), making it easy to infer when to use it. However, it does not explicitly state when not to use it or mention alternatives, but the context is strong enough to guide selection among similar timeline-related tools.

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