model_session

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

No annotations are provided, so the description carries the full behavioral burden. It does disclose some valuable traits — share merges changes, refuses clashes, and never overwrites; restore_version is undoable; select highlights for the user — but it is silent on whether `new` or `load` discards the current model, whether `save_version` overwrites an existing version, authorization requirements for `share`/`room`, and what `seconds` controls.

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 definition is compact and every clause carries information, but it is delivered as one long run-on sentence of slash-separated fragments and nested parentheses rather than a scannable list. For 13 distinct actions, this dense prose slows comprehension even though no words are wasted.

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 multiplexer with 13 actions, 8 parameters, no annotations, and no output schema, the description covers the actions and hints at a few return values (share returns a link, room lists participants). It is still missing the undocumented `seconds` parameter, version-listing return shape, and destructive/replacement semantics for new and load, so it is adequate but not complete for the tool's complexity.

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?

With schema description coverage at 0%, the parenthetical mapping does real work: steps for undo/redo, name for new/save_version, id for example/select/restore_version, path or doc for load, and text for say. However, the `seconds` parameter is never mentioned at all, and the description does not state which parameters apply to which actions beyond loose parentheses, so it only partially compensates for the empty schema documentation.

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 gives a specific verb and effect for each of the 13 action values (e.g. 'undo / redo (steps)', 'share this model for live editing', 'restore_version (id or name — undoable)'), so an agent can tell what any given call does. The umbrella phrase 'Model-level actions' is vague, and it never distinguishes the tool from siblings like `say`, `open_model`, or `model_describe`, which overlap with the `say` and `load` actions.

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 explains what each action does but gives no when-to-use guidance: it never says when to pick this tool over the sibling `say` tool for the `say` action, over `open_model` for `load`, or over `model_describe`/`model_query` for `versions`/`room`. There are no prerequisites, exclusions, or alternative routing, leaving selection entirely to inference.

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