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

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, so the safety profile is covered. The description's main behavioral detail is the 8-day / 7-day window cap, but that is repeated verbatim in the end_date schema description, so it adds little beyond structured data. No mention of pagination or result volume behavior in the prose.

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 dense sentence front-loads what the tool returns, then lists filters and the endpoint. Zero padding. The trailing 'GET /availability' is marginally redundant but harmless.

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?

With 15 parameters and no output schema, the description should say something about the shape of a returned slot (fields, ordering, pagination signal) so the agent knows how to consume results. It confirms the tool returns slots but not their structure, leaving a meaningful gap for an output-schema-less tool.

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 100%, so the schema already documents all 15 parameters in detail. The description only lists the filter categories (technician, crew, department, experience level, slot length) at a high level, adding no syntax or semantics beyond the schema. Baseline 3 applies.

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+resource ('Open time slots for technicians and/or crews') and names the scope coverage. It is clearly distinguishable from siblings like get_tech or list_techs, which retrieve entities rather than availability. Not quite a 5 because it doesn't call out a specific contrasting sibling by name.

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 implied (find open slots for scheduling) and the enumeration of filters signals it's a search tool, but there's no explicit 'use when' guidance or routing to/from alternatives. The agent must infer this is the availability-lookup tool.

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