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

Beyond annotations (readOnlyHint=false), the description adds critical behavioral context: permission checks, restrictions for FREE businesses, and required warning displays. It does not describe side effects or success/failure behavior but provides meaningful safety-related traits beyond the structured data.

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 description is reasonably concise, using multiple sentences to convey key usage instructions. It front-loads the main action, though the guidance section is somewhat dense. Every sentence adds value, but the structure could be improved for clarity.

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?

Given the complexity (6 parameters, nested object, 0% schema coverage, no output schema), the description lacks completeness. It provides usage prerequisites but fails to explain parameter details, return values, or error handling. The agent will need to infer or request additional information.

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 clarify parameters. However, it only mentions 'content and subject' (mailSubject). Other parameters (mailType, isEnabled, communityId, mailCourseOffer) and the structure of the 'content' object are not explained. This is a significant gap for the agent to correctly populate inputs.

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 description clearly states 'Update community mail content and subject' and clarifies that 'business and community refer to the same thing.' This makes the tool's primary purpose evident, though the interchangeable phrasing might cause slight confusion given the sibling tool 'update_community_mail'.

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?

Excellent guidance: explicitly instructs to check business permissions before offering, notes that FREE businesses cannot use this tool, directs to call 'check_business_tool_access' first, requires showing grace-period warning and resubscribe link, and states to never proceed when access is blocked. This covers prerequisites and constraints comprehensively.

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