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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false and openWorldHint=true, so the safety profile is covered by structured data. The description usefully reinforces that nothing is sent and names the endpoint, but it does not disclose what happens on duplicate names, name-uniqueness rules, or the non-idempotent behavior beyond the annotation.

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 front-loaded line with the write semantics and the key disambiguation first. The trailing endpoint path is the only element of marginal value to an agent selecting the tool.

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 two-parameter creation tool with a fully documented schema and no output schema, the description covers purpose, side effects, and endpoint. It could note that a template identifier is returned, since no output schema exists to convey that, but otherwise nothing needed for correct invocation 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% with only two required parameters, and the schema already documents the placeholder syntax for 'text' and the length bounds. The description adds no parameter meaning beyond what the schema provides, 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?

States a specific verb+resource ('create a reusable SMS template') and pre-empts the most likely confusion by asserting it does not send anything, which separates it from sibling sakari_send_message. It stops short of naming siblings explicitly, so it lands just under the top mark.

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?

The 'WRITE' prefix and the negative clarification imply the tool's role, but there is no explicit statement of when to use it versus sakari_list_templates (e.g., to check for duplicates) or when to prefer sending a message instead. Usage is inferable rather than guided.

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