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

Annotations already declare readOnly=false, idempotent=true, destructive=false, openWorldHint=true, so the description's added context is the differentiator: SSRF URL validation, GUID/URL deduplication so each post is sent once, the PUSHNOTIF_API_KEY requirement, and a per-subscriber credit cost of 1 per broadcast. It falls just short of 5 because it does not state what happens to an existing configuration when parameters are omitted (partial update vs reset).

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?

Front-loads the core action and the immediate-dispatch variant before routing, prerequisites, and cost. The middle sentence is dense with nested parentheticals and stacked clauses, which is efficient but slightly harder to scan than a cleanly split structure.

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 mutating multi-mode configuration tool with open-world network behavior, the description covers prerequisites, auth, validation, deduplication, billing impact, mode precedence, and even the return shape ({ ok, app_id, rss_enabled, ... }) despite no output schema. Nothing an agent needs in order to call it correctly is missing.

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 baseline is 3; the description still adds genuine meaning by clarifying that dispatch_now fetches and broadcasts 'even if rss_enabled=false', a precedence rule absent from the schema's property text. It also reinforces that rss_feed_url is required when enabling polling or dispensing, but adds no interval-duration or prefix-format detail beyond 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 and resource ('Configure automated 24/7 RSS, Atom, or XML Sitemap polling for an app_id') and adds the alternate mode ('trigger an immediate feed check and push broadcast via dispatch_now=true'). It also names the two siblings it is not (send_push_notification, schedule_push_notification), so an agent can discriminate it without opening a schema.

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 an explicit positive trigger ('when a blog, news portal, or store wants newly published URLs automatically broadcast') plus two explicit exclusions that name the correct alternative tool for each. It also states a prerequisite sequence ('call list_apps first to obtain app_id'), leaving nothing to inference.

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