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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the safety profile is fully covered. The description adds no behavioral detail whatsoever — no ordering, pagination, or scope caveats — so it contributes nothing beyond the structured metadata.

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 no waste, and the resource scope is front-loaded. It is efficient, though the terseness reflects under-specification rather than tightness of detail.

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, zero-required-parameter read-only list tool with full schema coverage and clear annotations, this is minimally adequate. With no output schema, the description could still say roughly what comes back or whether results are filtered/paged, and omitting that leaves a gap.

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 single 'channel' enum is documented as 'Only email or only SMS templates; omit for both'. The description mentions both channels but adds no syntax or default behavior beyond the schema, 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 is a noun phrase ('The user's saved email and SMS templates') that implies retrieval without stating a verb like list or fetch. It does scope the resource to the user's own templates, which helps separate it from get_message_template and preview_message_template, but the action remains implicit.

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 notes that these are 'what outreach workflow send_email / send_sms steps use', which is background context rather than guidance on when to call this tool. No alternatives are named and no exclusion or prerequisite is given; an agent must infer when to pick this over sibling list/preview tools.

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