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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the description earns credit only for additions — it discloses the default 24-hour window, the hard 30-day clamp, and the sms:read scope requirement. It does repeat "Read-only," which annotations already cover, but the windowing and permission details are genuine behavioral context.

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?

The intent hook is front-loaded and the payload list is dense but purposeful, and the final sentence cleanly separates follow-up routing from the main purpose. It is a long single sentence in the middle, but no clause is redundant.

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 an output schema present, the description does not need to specify return shapes, and it still tells the agent what content categories come back, the time window, the permission gate, and where to go next. For a two-optional-parameter aggregation tool with rich annotations, nothing material is missing.

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%, so both parameters are already documented as ISO-8601 with the same 24-hour default and 30-day clamp. The description restates the window semantics of `since` but says nothing about `business_id` (narrowing to one accessible business) or what happens if an inaccessible ID is passed, so it adds little beyond the schema.

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 uses a concrete framing ("Answer 'what did I miss?' in one read") and then enumerates the exact resources returned: calls since a moment with caller and intent, unheard voicemails with transcripts, inbound texts, and open to-dos/callbacks. That enumeration makes it unmistakably an aggregation tool rather than one of the list_* siblings.

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?

It gives explicit next-step routing: get_transcript for a specific transcript, send_message to reply, and list_recent_calls / list_sms_messages for history beyond the window. It also states the prerequisite that the texts section needs the sms:read permission, which is a real gating condition for invocation.

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