add_user_skills

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

No annotations are provided, so the description must disclose behavioral details. It states that it adds or updates skills, implying mutation, but does not explain what happens when a skill already exists (overwrite, error, merge), whether it is idempotent, or any authentication or authorization requirements. For a state-changing tool, this is insufficient.

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, clear sentence that front-loads the core action ('add'/'update') and the object ('skills'). It is appropriately sized with no unnecessary words, making it highly scannable and efficient.

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 a clear schema, the description covers the basic purpose but lacks important contextual distinctions from sibling tools (e.g., 'set_user_skills') and does not explain behavior boundaries like adding/updating vs. replacing. This could lead to incorrect tool selection in a larger set of skill-management tools.

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 schema already documents the 'skills' parameter structure, including the required 'name' and optional 'proficiency' enum with descriptions. The description's mention of 'update existing skill proficiencies' aligns with the schema but adds no new details beyond what the schema provides. With full schema coverage, the description offers only marginal extra value.

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 uses specific verbs 'add' and 'update' and identifies the resource 'user skills' with scope ('new skills or existing skill proficiencies'). It clearly conveys the tool's function, but it does not explicitly differentiate from the sibling tool 'set_user_skills,' so it is clear but not fully distinguished.

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 provides no guidance on when to use this tool versus alternatives, such as 'set_user_skills' or 'remove_user_skill.' It only says 'anytime,' which is not a contextual condition. There are no exclusions, prerequisites, or alternative tool mentions.

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