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

Annotations cover the mutation/destructive/openWorld profile, and the description adds genuinely new behavioral detail: account data will be POSTed to the URL, the receiver must complete a base64 X-Oblio-Request-Id handshake with a 200, and confirmation is mandatory. It stops short of describing success response or what happens on repeated subscriptions, but it earns credit for going well beyond the annotation set.

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 dense sentences with no filler: purpose, security/behavioral requirements, and the confirm gate, with the HTTP route appended for grounding. Everything is front-loaded and every clause carries 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?

For a destructive, non-idempotent, open-world mutation with no output schema, the description supplies the safety preconditions, receiver contract, and confirmation requirement an agent needs. Minor gaps remain around return value and duplicate-subscription behavior, though the idempotentHint=false annotation partially covers the latter.

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, but the description adds real semantic grouping to the topic enum by naming the event families (stock, drafts, updates, cancellations, collections) and reinforces the user-confirmation gate on confirm. The cif and endpoint parameters are left to the schema.

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 (subscribe/create) and resource (an HTTPS endpoint receiving Oblio events), and enumerates the event families covered (stock changes, draft/update/cancel of documents, collections). An agent can immediately distinguish this from oblio_list_webhooks and oblio_delete_webhook 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 clear preconditions: the endpoint must be user-named and user-controlled, must return 200 with the base64 of X-Oblio-Request-Id, and the call requires confirm: true. It does not, however, name alternatives such as listing existing webhooks first or deleting duplicates, so the routing guidance is partial.

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