get_timeline

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

No annotations are provided, so the description bears the full burden of behavioral disclosure. It does disclose the return content (summary breakdown, categories, milestones) and implies a read-only operation through the verb 'Retrieve', which adds value beyond the name. However, it does not address behavior for missing/invalid sessions, whether results can be filtered, or any limits on the timeline scope.

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?

A single, well-structured sentence that front-loads the primary action and outcome. Every phrase contributes meaning — there is no filler, and the key distinction ('summary breakdown') appears early.

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 tool with no output schema, the description adequately covers what the tool returns and at what granularity. The only notable omission is routing guidance to get_events for raw event detail, but that is more a usage-guideline concern than a completeness gap for a tool this simple.

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 schema already documents sessionId fully. The description adds only a loose contextual tie between the parameter and the timeline ('across the session timeline'), which is marginal enrichment. The baseline 3 is appropriate when the schema carries the parameter documentation burden.

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 ('Retrieve') and a distinct resource ('summary breakdown of events across the session timeline'), and specifies the contained content ('event categories and significant milestones'). This clearly conveys it is a summary-level view, implicitly distinct from raw event tools like get_events, though it does not explicitly name that distinction.

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 gives no when-to-use or when-not-to-use guidance. It does not mention alternatives such as get_events for raw event data, nor does it state any conditions that should route an agent to this tool over its siblings. Usage intent must be inferred solely from the word 'summary'.

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