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

Annotations indicate readOnlyHint=false and destructiveHint=false, consistent with the description's mutation (creation). Description adds value: explains return value (subscription id), delivery channel details (webhook auto-disable after 10 failures, SMS 10/day cap, phone verification). No contradiction.

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 fairly dense but well-organized: main action first, then requirements, then types, then delivery. Every sentence adds specific value. Slightly long but no redundancy. Could benefit from brief bullet formatting for type examples, but text is acceptable.

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?

Given the complexity (3 params, nested objects, no output schema), the description covers return value, type-specific parameters, delivery channels, constraints (SMS cap, webhook auto-disable), and workflow (phone verification). Missing explicit mention of how to use returned subscription id with sibling tools, but that's minor.

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%, and the description significantly enriches parameter meaning. For 'type', it lists all enum values with examples. For 'params', it gives per-type structures with specific fields (e.g., items, min_spread_bps, series_id). For 'delivery', it explains subfields (sms, email, webhook) with constraints and signing details.

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 clearly states the verb 'Create' and the resource 'proactive monitoring subscription to a live-data event stream'. It distinguishes from sibling tools like list_subscriptions, unsubscribe, and recent_alerts by focusing on creation. Supported types are enumerated with examples.

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?

Explicitly states the prerequisite: 'Requires a Pipeworx OAuth account (anonymous + BYO cannot persist subscriptions)'. Provides type-specific guidance (e.g., 'sec_8k' with items array, 'polymarket_edge' with topic). Does not explicitly say when not to use or compare to alternatives, but the sibling context makes it clear.

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