start_time_entry

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

No annotations provided; the description only says 'start a timer' without disclosing whether it stops existing timers, idempotency, or error conditions. Important behavioral traits for a timer tool are missing.

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 concise sentence. It is front-loaded and has no waste, but could benefit from a bit more detail without losing conciseness.

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 output schema, no annotations, and 5 parameters with 40% coverage, the description is incomplete. It does not explain return values, error handling, or behavior when parameters are missing, leaving significant gaps 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 coverage is only 40% (descriptions for team_id and tags). The description adds minimal meaning: 'optionally bound to a task' hints that task_id is optional, but other parameters like description and billable have no elaboration.

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 timer, optionally bound to a task.', specifying the action (start a timer) and optional resource (task). It distinguishes from siblings like 'stop_time_entry' and 'create_time_entry' by emphasizing starting a timer vs creating an entry.

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 vs alternatives like 'create_time_entry' or 'stop_time_entry'. No prerequisites, consequences of starting a timer when one is running, or context for using the optional parameters.

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