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

Goes well beyond annotations by disclosing the approved-only precondition, the refusal behavior, that it never approves, the required list_connections prerequisite, and the YouTube certification requirement (a compliance constraint not expressible in annotations). Does not explicitly restate destructive/idempotent semantics, but the approval and certification context substantially compensates.

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 purpose, then conditions and routing in efficient order. The embedded verbatim compliance sentence is necessarily long but earns its place by being a required disclosure. Slightly dense with parentheticals, but no filler.

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?

Covers preconditions (approved status, connection exists, future time), failure mode (refusal), prerequisites (list_connections, approve_post), and the critical YouTube legal/compliance certification. Complete for a mutation tool with no output schema.

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 schema already documents all five parameters including the approved precondition and future-datetime constraint. The description adds the connectionId sourcing (list_connections) and confirms the approval constraint, but largely overlaps the schema. Baseline 3 is appropriate.

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 (schedules), resource (an already-approved post), and target (a connected channel at a future time). This clearly differentiates it from publish_post (immediate), approve_post (approval), and create_post (creation).

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?

Explicit preconditions and routing: refuses if status != approved, directs to approve_post or the dashboard first, directs to list_connections for connectionId, and gives a YouTube-specific pre-call requirement. Covers when-to-use, when-not, and alternatives thoroughly.

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