Probe the complete closure/reflection primitive surface

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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds two useful behavioral facts beyond the annotations: primitives are NOT invoked ('without calling it') and an active-client is required. However, the remaining 'Phase/cost/idempotency/Safety' lines largely restate the annotation hints.

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 first sentence is a strong, front-loaded purpose statement, but it is followed by a templated block (Phase, cost, idempotency, Capabilities, Produces, Safety, On failure) that repeats annotation data and is only loosely integrated. The 'On failure' pointer to tool-schema is useful, but overall the entry is padded.

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 zero-required-param, read-only probe with a fully documented schema, this is adequate. Yet there is no output schema and 'Produces: structured-result' gives no sense of what the capability matrix contains, leaving the agent unable to anticipate the return shape.

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 100% and the single parameter is optional, so the baseline is 3. The description only echoes the schema with 'Signature: { threadContext: number? }' and adds no syntax, default, or semantic detail beyond it.

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+resource ('reports the selected alias for every primitive without calling it') and identifies the scope as the official Volt closure library plus debug closure operations. It is distinguishable from introspection siblings like get-closure-protos, though it does not name a sibling to contrast against.

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?

'Phase: verify' and 'Requires: active-client' imply when the tool is relevant and what precondition is needed, but there is no explicit statement of when to choose this over tool-schema, list-tools, or get-closure-protos. Usage is implied rather than directed.

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