start_timer

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

No annotations are provided, and the description does not disclose behavioral traits such as whether it overwrites an existing running timer, authentication needs (despite api_key parameter), or what the response contains. The output schema is present but not referenced, leaving significant gaps.

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 brief with two sentences and front-loads the primary action. However, the brevity sacrifices completeness; it could be slightly more informative without being verbose.

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 no annotations, 4 parameters (1 required), and an output schema, the description fails to explain return values, authentication requirements, or behavior when a timer is already running. The sibling stop_timer suggests a lifecycle, but no guidance is provided, leaving it incomplete.

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?

With 0% schema description coverage, the description adds some meaning by linking 'task description' to the task parameter and 'comma-separated tags' to tags, but it does not explain the required project parameter or the api_key parameter, which is critical for authentication. The meaning is incomplete.

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 'Start a time tracking timer for a project' with a specific verb and resource, and it distinguishes itself from sibling tools (get_report, list_entries, stop_timer) by being the only tool that starts a timer.

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 use when starting a timer but gives no explicit guidance on when to use this versus alternatives, nor does it provide exclusions or prerequisites. The optional nature of task and tags is mentioned but no context for use.

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