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

Annotations already declare readOnlyHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds that the response includes lifecycle, arms and an opaque operation reference, but does not say whether the opaque reference must be fed elsewhere or how staleness is handled.

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 sentence with no filler, and the negative constraint is placed after the core purpose. Slightly dense with stacked jargon ('arms', 'opaque operation reference'), but no wasted text.

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, so the description must convey return semantics; it partially does by naming the returned concepts (lifecycle, arms, operation reference). However, with two undocumented parameters and no note on permissions or whether the operation reference is required for follow-up calls, it falls short of fully equipping the agent.

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 only 33%: customer_id is documented in the schema, but experiment_id and connection_context carry no descriptions anywhere. The description does not compensate by explaining the id format or what connection_context is, so two of three parameters are semantically opaque.

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 (Read) and resource (native experiment lifecycle, arms, opaque operation reference), which is enough for an agent to know this is a state-inspection tool. It also implicitly separates itself from the many experiment mutation siblings, though 'arms' is domain jargon that could be clearer.

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 clause 'does not initiate or promote experiments' effectively routes the agent away from the experiment_initiate/experiment_promote siblings toward this read-only variant. It gives a clear boundary but never names the alternatives explicitly or states prerequisites (e.g., that a connection_context is needed).

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