Build timeline

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

Annotations declare readOnlyHint=false and destructiveHint=false; the description aligns by describing a write/storage operation without claiming read-only behavior. It adds useful behavioral context by specifying verification checks and the exact failure mode with a check list.

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?

One dense sentence covers action, verification criteria, outputs, and failure behavior with no filler. The parenthetical check list is compact and the final failure clause is high-signal.

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 single-parameter tool with no output schema, it describes the operation, validation rules, stored artifacts, and failure behavior. It lacks prerequisites and the return value shape, but those are minor for this build/verify/store workflow.

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 description never mentions the single required parameter timelene_id or explains how it identifies the timeline. With 0% schema description coverage, the description should compensate, but it relies entirely on the property name and title.

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 concrete actions (emit, verify, store) on a specific resource and names the artifact outputs, which distinguishes it from siblings like create_timeline or publish_timeline. It does not explicitly call out sibling differences, but the verification pipeline and artifact storage make the purpose clear.

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?

No guidance on when to use this tool versus alternatives such as run_layout_preview or publish_timeline. The described workflow implies a build-after-creation context, but this is left to the agent to infer.

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