added_on_this_day

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

With no annotations provided, the description carries the full behavioral burden. It explicitly says 'Read-only,' which is a useful non-mutating flag, but it does not disclose pagination/scan behavior, rate limits, or output characteristics beyond the schema's parameter notes.

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 sentence that is front-loaded with the core behavior and ends with the useful read-only flag. No filler or repetition; every word earns its place.

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 read-only query tool with fully schema-documented parameters, this description is adequate for selection and invocation. It lacks an output schema and does not describe result shape beyond 'show tracks,' but the core behavior and safety profile are sufficiently conveyed.

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%, with all three parameters (scan_cap, max_results, response_format) documented with types, defaults, and enum values. The tool description adds no parameter-specific meaning beyond the schema, so the baseline of 3 is appropriate.

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 ('Show'), resource ('tracks you saved'), and a distinctive temporal filter (calendar day month+day in previous years). The 'on this day' framing makes the intent unmistakable and separates it from generic saved-track listing tools like get_saved_tracks.

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 intended use case is evident from the description, but there is no explicit when-to-use or when-not-to-use guidance. It does not name alternatives or exclusions, leaving the agent to infer when this tool is preferred over related saved-track or search tools.

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