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

No annotations are present, so the description carries the full burden of behavioral disclosure. It does mention 'idempotent' (safe to retry) and 'metered' (likely cost/rate implications), which are valuable traits. However, it does not disclose side effects such as whether a new thread is created, what the response contains, or any prerequisites like authentication or existing thread context.

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 a single, focused sentence that front-loads the key action and qualities. It is concise and avoids redundancy. However, it could be slightly restructured to include usage guidance without becoming verbose, so it loses a point for not maximizing the space.

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 that starts a conversation, the description is incomplete: it does not explain what a 'Dex conversation' is, what the 'web-channel contract' entails, what the expected output is (e.g., a thread ID), or how to handle the required messageId (e.g., for idempotency). With no output schema and no annotations, the agent is left with insufficient context to call it correctly.

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% – the schema provides no descriptions for 'message' or 'messageId'. The description does not mention either parameter or explain their purpose or format. Since the description must compensate for the schema's lack of detail and it fails to do so, this is a significant gap for an agent trying to construct a valid call.

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 states a specific verb ('Start') and resource ('Dex conversation'), and adds useful qualifiers ('idempotent, metered'). However, it doesn't explicitly differentiate this from the sibling devtune_send_dex_message or other conversation-related tools, so while the purpose is clear, the boundary to alternatives is implied rather than stated.

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 provides minimal context about when to use this tool ('same web-channel contract as the in-app dock') but offers no explicit guidance on when to choose it over devtune_send_dex_message, devtune_list_dex_threads, or other siblings. No exclusions or conditions are mentioned, leaving the agent to infer appropriate usage.

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