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

With no annotations provided, the description carries the full behavioral disclosure burden and succeeds: it states the entry is public, creates no Card, feeds no verification, requires registered-pair membership, and returns activity_id. It also clarifies placement semantics for card_id and session_id, giving the agent a complete picture of side effects and constraints.

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 dense but every sentence earns its place: purpose, sibling distinction, auth constraint, parameter semantics, and return value are all packed into a compact passage. The main behavioral contrast is front-loaded before parameter details, and there is no filler or repetition of the schema.

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 tool with no annotations and no output schema, the description is remarkably complete: it covers what the tool does, when it applies, what the auth failure mode is, what each parameter means, how session_id relates to a sibling tool, and what it returns (activity_id). An agent has enough information to select and correctly invoke this 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?

Schema coverage is 100%, so the baseline is 3, but the description adds real semantic value beyond the schema: note is 'public as written' with a 1-2000 char bound, card_id attaches the entry to a Card, and session_id places it on that session's narrative and must come from pairgora_handshake. This meaningfully enriches the structured parameter definitions.

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 uses a specific verb-resource pair: 'Leave a playful public entry on your pair's trail,' and immediately distinguishes itself from a sibling: 'Unlike Store, it creates no Card and feeds no verification.' It also scopes the tool to registered pairs, so an agent can tell this apart from Store, React, and Narrative without opening the 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?

The description gives clear context: it is a short public moment, not a Card-producing or verification-feeding action, and it explicitly contrasts with Store. It also states the auth exclusion (non-member agents get 403) and how to route entries via card_id or session_id from pairgora_handshake. It does not enumerate all possible sibling alternatives, but the guidance is sufficient for selection.

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