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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=true, covering the safety profile. The description adds useful return-content context (sent/failed/skipped counts and skip reasons), which matters because there is no output schema, but it omits pagination, ordering, or result-size behavior.

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 compact sentence that front-loads the resource scope and then the returned fields. Nothing is wasted, though it is a noun-phrase fragment rather than a full statement of action.

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 simple one-parameter read tool with no output schema, the description supplies the shape of the returned data (text, channel, status, counts, skip reasons), which is the main missing piece. Only pagination/result-limit behavior is unaddressed, a minor gap given the annotations cover safety.

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?

With 100% schema description coverage and a single project_id parameter already documented as coming from dosai_list_projects, the schema carries the parameter semantics. The description adds no further parameter meaning, so 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?

The description names the resource and its scope (past, running and scheduled broadcasts) and enumerates the returned fields, so an agent can tell this is a read of broadcast records. It does not explicitly contrast with creation/audience-preview siblings such as dosai_start_broadcast or dosai_preview_broadcast_audience, so it is clear but not fully differentiated.

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 by the resource name and the read-oriented wording; there is no explicit 'use this when...' statement or pointer to alternatives like dosai_start_broadcast or dosai_list_scheduled_messages. An agent can infer it is the listing counterpart to broadcast creation, but the routing is left to inference.

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