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

Annotations already cover the safety profile (readOnlyHint=true, openWorldHint=false, destructiveHint=false). The description adds real behavioral detail beyond them: a hard 50-event cap on the first response, newest-first ordering, a 500-row ceiling for the public API, and the fields each event retains. It stops short of error or rate-limit behavior.

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?

Three sentences, no filler. The result cap and ordering come first, then the retained fields, then the routing hint, which is the right front-loading for a list tool.

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?

With no output schema, the description usefully compensates by describing cardinality limits, ordering, and returned fields. It does not explain what 'public' excludes or how failures surface, so it is strong but not fully complete.

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% and the single slug parameter is documented as coming from search_builders, so the schema carries the load. The description adds nothing about the parameter beyond implying the returned events belong to that builder, which is the expected baseline.

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?

Specific verb (Read) plus resource (public timeline events) with an explicit scope: first 50, newest event date first. It also names the sibling get_builder_changes as the paging path, so an agent can separate it from the other builder tools without reading schemas.

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 tells the agent when to reach for another tool (use get_builder_changes to page further) and constrains the initial call to the first 50 events. It does not, however, say when this tool is the wrong choice relative to get_builder_risk, get_builder_coverage, or get_builder_changes for non-paging use cases.

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