create_txt_record

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

Annotations (openWorldHint, idempotentHint, destructiveHint:false) already declare the safety profile; 'Upsert' is consistent with idempotentHint, so no contradiction. The description adds genuine behavioral value beyond annotations: automatic value quoting, the cleanup expectation, and the 'upsert' semantics. It doesn't mention auth needs or conflict behavior, but with annotations carrying the safety profile a 4 is fair.

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?

Four sentences with zero filler. The core purpose is front-loaded, followed by use case, cleanup instruction, and sibling differentiation. Every sentence earns its place and the most actionable constraint (auto-quoting) is embedded early.

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?

An output schema exists, so return values need no elaboration. Given the moderate complexity (3 params, 2 required), the description covers purpose, use cases, cleanup, and alternative routing. In a rich sibling context of 23 tools, the description fully disambiguates create_txt_record from create_domain_record and delete_txt_record.

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 all three params are already documented, setting the baseline at 3. The description adds meaningful value beyond the schema by explicitly stating the value auto-quoting behavior ('Quotes the value automatically if the caller didn't'), which maps directly to the value param, and reinforces the domain format with a concrete example.

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 ('Upsert a Route 53 TXT record') plus concrete use cases (ACME DNS-01 challenge, domain verification) with a real example name (_acme-challenge.<domain>). It also names the specific sibling it relates to (issue_wildcard_cert) and the sibling it is not (create_domain_record), so an agent can differentiate without opening schemas.

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 explicit when-to-use context (DNS-01 challenge, domain verification), tells the agent to clean up afterward with delete_txt_record, and explicitly routes the CNAME case to create_domain_record instead. Alternatives and exclusions are both stated directly.

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