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

Annotations already declare the safety profile (readOnlyHint=false, destructiveHint=false, openWorldHint=false, idempotentHint=false), so the description carries a lighter burden. It adds the shared/team-reuse context, but says nothing about duplicate handling, permissions, or length limits beyond what the schema documents.

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?

Two short sentences, with the core action front-loaded before the parenthetical sibling reference. The second sentence is motivational rationale that is useful but not strictly necessary, so it falls just short of maximally lean.

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 single-object create call with 100% schema coverage and no output schema, the description supplies enough: what it makes, where it is used (inbox), and a pointer to the listing tool. Return values need not be described, though duplicate/error behavior is unaddressed.

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%: title, text (with 5000-char cap), and idempotencyKey retry semantics are all documented in the schema. The description adds no parameter-level meaning, so the 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 states a specific verb and resource ('Save a reply the team can reuse in the inbox'), which clearly maps to creating a reusable reply template, and it points at the related read tool list_saved_replies. It does not explicitly contrast with the sibling write tools (update_reply_template, delete_reply_template), but those distinctions follow from the names.

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 through the rationale ('turning a good answer into a template'), and list_saved_replies is offered as a companion read. However, it never says when to use this versus update_reply_template or delete_reply_template, nor any prerequisites, so the guidance is suggestive rather than explicit.

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