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

Annotations already declare readOnlyHint and destructiveHint=false, and the description reinforces rather than contradicts that with a clear negative-scope list. It also discloses the return payload despite having no output schema. A minor gap: no note on size limits or whether instructions are cached/versioned beyond the 'revision' mention.

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 sentences: purpose first, return payload second, scope/next-step third — good front-loading with no filler. The phrasing 'for testing changing preview/staging URLs' is slightly awkward, but every sentence contributes new information.

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?

With no output schema, the description does the necessary work by listing the returned artifacts and stating what the tool will not do. It stops short of explaining what 'allowlisted saved project facts' entails or any authentication/precondition needs, which a fully complete definition would cover.

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%, including a detailed 'context' parameter and the 'workflow' enum, so the schema carries all parameter meaning. The description adds essentially nothing about individual parameters beyond implying the preview-testing workflow, which matches the required baseline of 3.

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 names a specific verb and resource ('Get project-specific instructions ... for changing preview/staging URLs') and enumerates the concrete artifacts returned (copyable prompt, SKILL.md, revision, allowlisted saved project facts). That level of specificity separates it cleanly from neighbors like get_project_memory and get_install_command.

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?

It gives an explicit next-step rule ('Use run_tests.base_url for the exact deployment after checking hardcoded URLs') and states exclusions ('does not select a deployment, change settings, or prove script portability/access'). What's missing is a direct comparison against sibling retrieval tools such as get_project_memory or get_framework_handoff, so the agent still has to infer which retrieval to call.

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