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

Beyond the annotations, the description discloses important behavior: only supplied fields are updated, past spawned instances are left alone, and changes apply only to future spawns. This is genuinely valuable behavioral context for a mutation tool.

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 core behavior is stated in the first two sentences, with no filler, and the parameter list is compact and directly useful for a six-parameter tool. Every sentence 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 partial-update tool with no output schema, the description is self-contained: it covers all parameters, the scope of mutation, and special clearing rules. No essential information for invoking the tool correctly 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 coverage is 0%, and the description fully compensates: it explains every parameter's purpose, optionality, and special clear semantics, including YYYY-MM-DD for end_date, empty string to clear, and 0/null to clear category_id.

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 clear, specific action and resource: 'Update a recurring transaction template.' This distinguishes it from update_transaction and create/delete_recurring_transaction by emphasizing the template and its future-spawn scope.

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 description gives clear usage context by explaining partial updates and that past spawned instances are unaffected, so an agent knows when this operation fits. It does not explicitly name alternatives or exclusion conditions, so it stops short of a 5.

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