Dial

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

Annotations already declare readOnlyHint=false, idempotentHint=false and openWorldHint=true, so the mutating/non-repeatable nature is covered structurally. The description adds nothing beyond that — no note that this places a real call, that it requires the device identified by mac to be registered, or what happens on repeat invocation.

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?

It is short and front-loaded, but the brevity is under-specification rather than economy: the only second sentence is a raw endpoint path that gives an agent little actionable information. Nothing is verbose, yet nothing extra earns its place either.

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 non-idempotent, open-world telephony action with three required parameters and no output schema, the description leaves critical gaps: what a successful dial produces, what errors occur (invalid mac, busy line), and how it relates to the rest of the CTI tool family. This is insufficient context to invoke it confidently.

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 four parameters (mac, line, number, response_format) are documented in the schema itself. The description adds no meaning beyond it — e.g. what 'line' selects on the device — so the baseline of 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 essentially a restatement of the name/title ('Dial') plus the raw HTTP path. It never says what dialing means here — placing an outbound call from a specific device — nor distinguishes it from siblings like placetel_cti_dial_digit or placetel_initiate_call. An agent must infer the resource and the effect.

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?

There is no when-to-use guidance at all, and the sibling set contains several plausibly-confusable operations (placetel_cti_dial_digit, placetel_initiate_call, placetel_cti_answer). Nothing states the precondition that an active CTI session/device context is required before dialing.

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