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

readOnlyHint=true already establishes the safety profile, so the description is free to add value — and it does, enumerating the returned fields (name, recipients, credit cost, send time, pending_cancel), which no annotation conveys. It stops short of noting behavior for an unknown id or whether pending_cancel reflects live state.

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 with the verb and scope front-loaded and no filler. The parenthetical field list is dense, useful information rather than padding.

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 no output schema, the field enumeration is a meaningful stand-in for return-value documentation, so an agent knows roughly what comes back. Marginally incomplete on id provenance and failure behavior, but nothing essential is missing for a simple read-by-id 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 description coverage is 100%, and the id parameter is documented with a UUID pattern, so the schema carries parameter meaning fully. The description only echoes the id requirement and adds no format or sourcing detail beyond it.

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 and resource ('Get one outgoing text broadcast by id') and scopes it to a single item, which distinguishes it from dialmycalls_list_texts and dialmycalls_get_incoming_text without ambiguity. The parenthetical field list further pins down what 'get' returns.

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?

'by id' implies the retrieval use case versus the list tool, but the description never explicitly says when to use this over dialmycalls_list_texts, nor where the id comes from. Usage is inferable rather than stated.

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