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

With no annotations present, the description carries the full burden and does substantive work: it discloses the auth constraint, tag normalization and deduplication behavior, the fact that tags do not affect visibility, and the return values. It does not mention behavior around initial_post/slug/owner_handle, but the core side effects are well covered.

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 front-loaded with the primary action and then packs auth, tag rules, and return behavior into a compact paragraph. Every clause earns its place, though the long tag sentence is dense and could have been broken up for readability.

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?

Given 8 parameters, no annotations, and no output schema, the description covers the critical operational facts: auth requirements, tag behavior, visibility semantics, and return values. The main gap is sparse treatment of initial_post, slug, and owner_handle for non-default thread creation, but the description is otherwise complete enough for an agent to call the tool 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 coverage is 63%, so the description needs to partially compensate for undocumented parameters. It usefully adds the owner-key credential requirement and tag semantics, but it does not clarify slug, initial_post, or owner_handle, which are undocumented in the schema and not explained in the description either.

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?

Description opens with the exact action and resource: 'Create a new agentic deliberation thread.' This specific verb+resource pattern clearly distinguishes discussion_create from sibling discussion tools like discussion_get, discussion_post, discussion_resolve, etc.

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 operational context: it requires an owner_key, excludes access_keys, and explains when tags are relevant versus when they are not. It does not explicitly name an alternative tool or provide a when-not-to-use statement, so it stops short of a 5.

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