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

The readOnlyHint annotation already establishes this is a safe read. The description adds the useful scoping detail that results are limited to the authenticated user's own daily habits, plus the REST endpoint mapping. It still says nothing about ordering, pagination, or volume, which are the traits a listing tool would benefit from disclosing.

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?

Two sentences, zero padding, with the core purpose front-loaded and the endpoint mapping relegated to a short trailing clause. Nothing could be removed without losing information.

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 parameterless, read-only list operation, the definition covers what an agent needs to decide to call it. Since there is no output schema, a brief note on what a habit record contains would have made it fully self-contained, but that is a minor gap.

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 tool takes zero parameters, so there is no parameter semantics to document and the baseline is 4. The description correctly implies no filtering input exists by describing a simple current-user listing.

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 gives a specific verb and resource ('List the authenticated user's daily habits'), which is unambiguous and scopes the result to the current user's daily habits. It does not explicitly contrast with the sibling reclaim_get_habit, but the plural 'list' vs. singular retrieval distinction is clear enough from the verb alone.

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?

Usage is only implied: listing habits is the natural read operation, and the phrase 'daily habits' hints at the resource subset. There is no explicit statement of when to prefer this over reclaim_get_habit, nor any precondition or exclusion noted.

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