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

Annotations already provide readOnlyHint=false, destructiveHint=true, idempotentHint=true. Description adds useful context: 'Effect: subscriber-change', permissions (live_actions:write, subscribers:write), and an API reference link. No contradictions with annotations.

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?

Description is four sentences, front-loaded with the primary action. Additional info (effect, retry, permissions, link) is relevant and non-redundant. Could be slightly more concise but overall efficient.

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?

The tool has an output schema (not shown but flagged), so return value details are not required in description. Behavioral aspects (idempotency, effect, retry) are covered. No mention of error handling or rate limits, but sufficient for a focused mutation tool.

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?

Input schema has 100% coverage with clear descriptions for both parameters (sequence_id, subscriber_id). The description adds no new information about their meaning or format beyond what the schema provides.

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 'Removes the selected subscriber from the selected sequence', using specific verb and resource. It distinguishes from sibling tools like subscribers_add_to_sequence by focusing on removal.

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 says when to use (to remove a subscriber from a sequence) and what happens if the subscriber is absent (idempotent return). Provides retry guidance: 'Retry after reading the current resource state.' Does not explicitly list alternatives, but sibling context implies them.

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