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

Annotations already declare destructiveHint=true, openWorldHint=true and idempotentHint=false, but the description adds materially more: execution queues an immutable request, pending/processing means queued rather than sent, only the approved name/message/reply email are shared, no marketing permission or introduction consent is granted, and no host reply should ever be promised. That is unusually rich disclosure of side effects and guarantees.

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?

Content is dense and almost every sentence carries distinct, non-redundant information, and the primary usage constraint is front-loaded. It is slightly choppy and reads as a series of clipped constraints rather than a structured flow, which keeps it short of a 5.

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?

With no output schema, the description covers what an agent needs: prerequisite tool, required inputs, approval requirements split by context, what is transmitted, how queued states map to delivery, where to check provider acceptance, and the explicit limitation that no host reply is guaranteed. Nothing essential 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 description coverage is 0%, so the description must compensate. It does so by tying requestId and reviewHash to their origin in prepare_host_contact and confirming the approval flag ("confirmed true"), which gives the agent the provenance and coupling semantics the schema lacks. It stops short of explaining the 64-hex format or that these are opaque tokens, so it is strong but not complete.

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 (send the host contact) and clearly distinguishes itself from its two siblings: prepare_host_contact stages the review, and get_host_contact_status reports the outcome. An agent can tell what this tool does and what it does not (no reply, no delivery confirmation) 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?

Explicit sequencing ("stage this alone immediately after prepare_host_contact") and explicit context branching ("In SocialLoop chat... Outside chat, explicit approval of the exact review is required"). It also names the sibling that owns status checking, so the agent knows where to route follow-up questions.

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