Set Tracker entity permissions

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

Annotations already declare idempotent=true, destructive=false and openWorld=true, so the safety profile is covered. The description adds genuinely non-derivable behavior: the body accepts only grant/revoke actions, and the call returns the resulting permission set. It omits whether unmentioned principals are preserved (merge vs replace) and what authorization is required to change ACLs.

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 short sentences, all load-bearing: mutation + return value first, then the body constraint, then the precondition. The example is compact and illustrative rather than padding, and the key scoping fact is front-loaded.

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 3-parameter mutation tool with deeply nested objects, no output schema, and annotations covering the safety profile, the description supplies what is missing: the return value, the allowed action set, and the read-before-write workflow. An agent can construct a valid call from description plus schema without further assumptions.

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 the baseline is 3. The description goes beyond the schema by supplying a concrete nested example payload ('{"acl": {"grant": {"READ": {"users": [...]}}}}') and by clarifying that only grant/revoke are accepted at the top level of acl, which reduces misuse of the deep structure.

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 and resource ('Change an entity's access rules') and even names the return value, so an agent knows this mutates ACL state and yields a permission set. It references a complementary sibling (entities_permissions_get) but never distinguishes itself from the near-identical tracker_entities_permissions_update_direct, which is the real selection risk here.

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?

Gives an explicit prerequisite workflow: 'Read the current ACL first with entities_permissions_get,' which is actionable routing guidance rather than vague context. It stops short of stating when-not to use it or how it differs from the *_update_direct variant, so no explicit exclusion is provided.

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