vyntryx_post_message

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

Annotations already declare this is a non-read-only, non-destructive, non-idempotent, closed-world write, so the safety profile is covered. The description usefully adds that the message becomes visible in the Vyntryx UI, but says nothing about persistence, whether the session must be live, or broadcast semantics for other users.

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?

A single front-loaded sentence with the verb and target stated first and zero padding. It is efficient but leaves obvious room to add the missing session_id and lifecycle context without becoming bloated.

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?

An output schema exists and annotations cover the mutation profile, so return values and safety need no explanation. However, with two required parameters at 0% schema coverage and no guidance on session lifecycle or where session_id comes from, an agent still lacks information needed to invoke it confidently.

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% and both properties are bare titles, so the description must compensate and largely does not. 'text' is inferable from 'Post a message', but session_id is never explained — not where to obtain it (e.g., from vyntryx_scan_status) nor what happens if it is invalid.

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+resource+target: posting a message into a scan session's chat, and adds the observable effect that it appears in the Vyntryx UI. It is distinguishable from the read-side sibling vyntryx_session_messages by implication, but never names it or any sibling explicitly.

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?

Usage is only implied by the description ('into a scan session's chat'), with no statement of when to prefer this over vyntryx_session_messages or other tools, and no prerequisites such as needing an active session or authentication.

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