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

Goes well beyond the annotations by disclosing the auth scope (bookings:write), the dry-run nature of the first call, name-based rejection of unsupported fields, and the confirm_token round-trip. It stops short of saying what the final call actually causes externally (client email, calendar occupancy, how to undo), which matters given openWorldHint=true and destructiveHint=false.

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?

Four short sentences, front-loaded with purpose and cost, then the two-call model. Nothing is repeated from the title and nothing extraneous remains.

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?

The workflow and safety model are adequately explained for a write tool with no output schema, but with six undocumented required parameters the agent still has to guess at formats for timestamps and timezone before either call can be made.

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 only 14%, so the description must carry the parameter burden and it does not: name, first_name, email, starts_at, ends_at and timezone get no format, ordering or constraint guidance. Its only useful contribution is that unsupported fields are refused by name — notable because the schema declares additionalProperties=true.

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?

Specific verb (book) plus a narrowly scoped resource (a client who is not on DJfindr). The 'not on DJfindr' qualifier effectively separates it from sibling book_dj without the agent needing to open either schema.

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?

Explicit two-phase protocol: first call validates without changing anything, then a second call with confirm_token is made only after the person agrees to the summary. The condition that selects each call is stated outright, not inferred.

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