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

With no annotations, the description carries the full burden. It discloses idempotency, the update-instead-of-duplicate behavior, that it never deletes anything, the need for MCP_API_KEY bearer token, and the confirmation-before-write requirement. This is comprehensive and leaves no hidden side effects unaddressed.

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 dense but every sentence earns its place: primary purpose, dependent tools, idempotency/update behavior, safety, auth, confirmation, and usage trigger. It is front-loaded with the core action and progressively adds context. No filler.

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?

The description covers purpose, usage, side effects, and auth, and the schema documents all parameters. The only gap is the lack of any mention of the return value or response format, which could matter to an agent expecting a confirmation object. Still, for a mutation tool with rich context, this is a minor omission.

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 coverage is 100%, so the baseline is 3. The description does not add parameter-specific guidance beyond the schema; however, the schema itself is detailed (e.g., 'tagline' notes 'under ~60 chars', 'description' notes it feeds directory copy). The description adds no extra param semantics, so a baseline 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 opens with a specific verb and resource ('Start tracking one of your products on the connected Sellular account') and explicitly names the sibling tools that depend on it (check_submission_readiness, generate_submission_kit, etc.), distinguishing it from list_tracked_sites. It also clarifies the update semantics, leaving no ambiguity about what the tool does.

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 usage condition: 'Use when a product is missing from list_tracked_sites.' It also explains the idempotent retry behavior and the prerequisite of a bearer token, and implicitly differentiates from list_tracked_sites (which lists) and the other account-scoped tools (which require prior tracking).

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