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

Annotations already declare readOnlyHint=false, idempotentHint=false and destructiveHint=true, so the safety profile is covered. The description adds no behavioral context beyond that: it doesn't say whether short_code must be unique, what happens on a duplicate, or what the call returns.

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 tight sentences with zero waste: purpose first, then a compact explanation of each parameter. Everything is front-loaded and earns its place.

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 2-param create tool with no output schema and annotations covering the safety profile, the description covers purpose and both parameters adequately. It stops short of the operational details an agent would want (short_code uniqueness/conflict behavior, response shape).

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 coverage is 0%, so the description must compensate, and it does: short_code is defined as the text typed after '/' and content as the inserted text. That is meaningful domain semantics well beyond the bare maxLength constraints in the schema, though it omits uniqueness/format rules.

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 ('Create a new canned response') and glosses the domain term as 'saved reply'. The verb makes the separation from update/delete/list canned response siblings clear, though it doesn't name an alternative explicitly.

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?

No when-to-use context, no prerequisites, and no mention of the alternatives (update_canned_response, list_canned_responses). Usage is only implied by the verb, leaving the agent to infer everything about context.

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