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

With readOnly/idempotent/openWorld annotations already present, the description adds genuinely new behavioral context: determinism of the returned order, a 'quality unknown' quality warning, real pricing ($0.002 USD per call at the direct resource URL), and explicit domain exclusions. These go beyond what the structured annotations alone communicate.

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 with no filler: purpose is front-loaded, the intended-domain/exclusion warning comes second, and cost disclosure closes it. The phrase 'Intended for trust identity permission / quality' is slightly awkward and undercuts the tool's clear functional purpose, but overall the description is compact and every sentence earns its place.

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?

With no output schema and no parameter descriptions in the schema, the description carries the full burden of explaining both inputs and outputs; it covers the return value at a high level ('deterministic execution order or concrete blockers') and discloses pricing, but it does not explain what a 'blocker' looks like, which failure cases produce it, or how to disambiguate among roughly ten same-named control-plane siblings.

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 0%, so the description must compensate, but it only loosely maps 'workflow dependencies' to edges and 'execution constraints' to max_total_cost/max_total_latency_ms. It does not describe what nodes represent, whether cost/latency are per-node vs. aggregate, how 'enabled' affects the traversal, or how blockers/order are derived from the parameters — leaving the agent to infer meaning from parameter names alone.

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 first sentence states a specific verb ('Validates'), a concrete resource ('caller-supplied workflow dependencies and execution constraints'), and a well-defined outcome ('deterministic execution order or concrete blockers'). It does not, however, differentiate this tool from the nine other trust_identity_permission_control_plane_* siblings, since the same description could apply to all of them.

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 provides explicit negative guidance ('Do not use for legal, identity, sanctions, fraud, contractual, or regulatory adjudication') and a cost caveat, but it never states when the tool SHOULD be used or names alternatives such as workflow_dependency_validator or the trust_identity_permission_preflight/verification siblings. The phrase 'Intended for trust identity permission / quality unknown' implies a use case but leaves the appropriate trigger condition vague.

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