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

With no annotations, the description carries the full burden and does well: it discloses the action is free, requires ownership verification via a magic link sent to the supplied email (or meta-tag/DNS TXT), and lists the resulting capabilities (editing, badges, analytics, open-to-acquisition flag). It omits failure/rejection behavior and any rate or timing constraints, which keeps it from a 5.

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, front-loaded with the core action and cost, then requirements, then benefits. Each sentence carries information, though the verification detail is compressed into a slightly dense middle sentence.

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 two-parameter mutation tool with no annotations and no output schema, the description is nearly complete: it explains the verification flow and the unlocked capabilities. What the agent should do after calling (e.g., wait for the magic link, check verification status via toolfound_check_verification) is left implicit.

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 schema already documents both slug and email. The description reinforces the email guidance ('use an address at the product's domain') but adds no syntax or format details beyond what the schema provides, so the 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+resource — 'Claim an existing Toolfound listing as the product's owner' — and the word 'existing' implicitly distinguishes it from the sibling toolfound_submit_product, which handles new entries. It is clear without naming a sibling explicitly, so it falls just short of a 5.

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 clear conditions for use: the listing must already exist, ownership verification is required, and the email should be at the product's domain. It also presents alternative verification paths (meta-tag / DNS TXT). It stops short of stating when NOT to use it or naming submit_product as the alternative for unlisted products.

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