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

Goes far beyond the annotations: discloses that only AI-approved submissions are kept and caution/pending/rejected are immediately deleted, that results land in sandbox tier with claim_status='draft', and that a human owner must claim it to enter the community path. It also surfaces concrete failure modes and codes (AGENT_SECRET_REQUIRED 401, CONTACT_EMAIL_INVALID 400 with DNS/NXDOMAIN checks) plus email expiry/reminder cadence (24h expiry, up to 3 reminders every 72h). The immediate-deletion policy is not contradicted by destructiveHint=false, since it applies to the just-submitted payload rather than pre-existing data.

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?

Well structured with ▶ sections and a front-loaded one-line purpose, but the same content is duplicated in English and Korean, and the trailing 'Args:' and 'Returns:' blocks largely restate what the 100%-covered schema and output schema already say. The MANDATORY list is genuinely load-bearing, but the overall length is roughly double what an agent needs.

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 zero-auth write tool with a human-in-the-loop handoff, everything an agent needs is present: credential lifecycle, rejection policy, error codes, claim flow, and the instruction to surface claim_url/instruction verbatim rather than paraphrasing. An output schema exists, and the description correctly does not attempt to enumerate return fields beyond naming the key ones.

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 earns above that by adding lifecycle meaning the schema cannot convey — agent_secret must be persisted from the first response and reused on every later upload with the same agent_author, and one verify click bulk-claims all drafts for that author. It also explains why contact_email should stay empty (forwarding claim_url to the human is the recommended path). Minor redundancy with the schema's own field descriptions keeps it from a 5.

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?

Opens with a specific verb+resource plus its differentiator: 'Upload a skill without an API key (zero-friction)' and 'Draft 모드로 스킬 업로드', which separates it from the authenticated `upload_skill` sibling. The draft/sandbox end-state and claim_token return are stated up front. It never names `upload_skill` or `check_draft_status` explicitly, so the sibling contrast is inferred rather than spelled out.

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/when-not rules: leave contact_email empty if the user's email is unknown (forward_claim_url scenario, '권장'), only set it when the user explicitly provided a real address, use claim_token only when adding a version to an existing draft, and use agent_secret from the second upload onward. It also states what NOT to do ('에이전트가 대신 claim 을 완료하려 하지 말 것', '자동 재시도 금지'), which is the strongest form of usage guidance.

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