Get 10DLC brand

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

Adds context beyond annotations: mentions return includes 'identity status and trust score', and explains that NOT_FOUND covers cross-tenant access. No contradiction with readOnlyHint/destructiveHint.

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: first defines purpose and return shape, second covers usage and errors. Zero waste, every sentence adds value.

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?

Complete for a simple read tool with one parameter and rich annotations. Covers purpose, alternative, errors, and return contents. No gaps.

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 covers id fully, but description adds that it's a 'messaging-backend UUID' and references how to obtain it (from msg_list_brands/msg_create_brand). Enhances understanding beyond schema.

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?

Clearly states 'Get one of your 10DLC brands by its messaging-backend UUID', specifying the verb, resource, and identifier type. Explicitly distinguishes from sibling msg_lookup_brand for cross-tenant lookups.

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?

Provides explicit when-to-use (for own brands) and when-not-to (use msg_lookup_brand for brands not in account). Also lists relevant error types with HTTP codes and meanings.

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