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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is largely covered. The description adds real value by explaining it is a dry-run that evaluates hypothetical attributes and returns a pass/fail, and reassures that nothing is created or sent. It stops short of describing error behavior or what happens with an invalid trigger_id, keeping it out of 5 territory.

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?

Three sentences, front-loaded with the dry-run/no-email constraint so the key safety point lands first. Slightly repetitive, since 'WITHOUT sending any email' is restated as 'Does not create or send anything', which trims the score below 5.

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?

There is no output schema, and the description compensates by stating what is returned ('whether the conditions would pass given the contact attributes'). Combined with annotations that carry the safety profile and a fully documented schema, an agent has everything needed to call it correctly.

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%, so all five parameters (trigger_id, tags, source, status, custom_fields) are already documented in the schema. The description gestures at 'contact attributes you provide' but adds no syntax, format, or defaulting detail beyond that. Baseline 3 is appropriate when the schema carries the parameter burden.

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?

Specific verb+resource ('Dry-run a trigger's send conditions') with an explicit scope statement ('for a hypothetical contact WITHOUT sending any email'). It clearly distinguishes itself from send-oriented siblings like meisa_test_send_broadcast and meisa_send_email by emphasizing no mail is actually sent. An agent can identify this as a safe simulation tool without opening the schema.

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 phrase 'verify targeting before relying on the trigger' gives a clear context for when to reach for it. However, it never names an alternative sibling (e.g. meisa_test_send_broadcast, meisa_activate_trigger) or states when NOT to use this. Clear usage context, but no explicit routing or exclusions.

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