Create SVCB Record

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

The description adds a concrete behavioral detail beyond the annotations: 'replaces ALL existing SVCB records with the same name — previous SVCB records for this name will be overwritten, not merged'. This complements the 'destructiveHint: true' annotation by explaining the exact impact. No contradiction with annotations.

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 two sentences long, with the key behavioral warning front-loaded and the actionable pre-check advice succinctly included. Every sentence adds value with no fluff.

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 creation tool with destructive behavior and no output schema, the description adequately covers the most critical context: the destructive nature and pre-check recommendation. It does not describe the return value, but with no output schema this is acceptable and common for MCP tools of this type.

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?

The input schema covers all 8 parameters with descriptions (100% coverage), so the tool description does not need to add parameter meaning. The description provides no additional parameter-level details beyond what is in the schema, so a baseline score of 3 is appropriate.

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 uses a specific verb ('Create') and resource ('SVCB record (general service binding) for a domain'), clearly stating what the tool does. It distinguishes from sibling create_*_record tools by specifying the record type.

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 explicitly recommends using 'list_dns_records first to check for existing records', providing clear guidance on when to use this tool. However, it does not specify when not to use it or mention alternatives beyond the pre-check suggestion.

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