add_constant_timer

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

With no annotations present, the description carries the burden of behavioral disclosure. It does so well by explaining that under a Thread Group it delays every sampler and under a sampler it delays only that sampler 'before it fires.' It does not disclose side effects like whether an existing timer is replaced or what the response contains, but the core behavior is transparent.

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 sentences, tightly written, with no filler. The main action is front-loaded, and the scoping nuance follows in the second sentence. Every clause adds information needed to invoke the tool correctly.

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 relatively simple creation tool, the description is complete enough: it names the parent placement effect, the delay unit, and the timing of the delay. It does not explain planId explicitly or mention the response, but with no output schema and a simple mutation, the essential calling context is present.

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 only 25%, with delayMs already documented in the schema. The description adds useful meaning for parentId by explaining how parent type changes scope, but it gives no additional guidance for planId or name. This partially compensates for low schema coverage but does not fully close the gap.

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 opens with a specific verb and resource: 'Add a Constant Timer under the given parent to pace requests.' It then clarifies the exact behavioral scope for Thread Group vs. single sampler parents, which distinguishes it from sibling timer tools like add_uniform_random_timer and add_constant_throughput_timer.

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 context for use: it tells the agent what happens when placed under a Thread Group versus under a single sampler, and that its purpose is pacing requests. It does not explicitly enumerate alternatives such as 'use add_uniform_random_timer for randomized delays,' so it earns a 4 rather than a 5.

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