session_set_cell

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

No annotations are provided, so the description carries full behavioral transparency. It discloses two important side effects: demotion of computed cells to plain inputs and lazy recomputation of dependent cells. This is solid, though it omits potential edge cases like whether the session must be open.

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 two sentences, front-loaded with the main action and immediately followed by important behavioral details. Every sentence adds value with no filler or redundancy.

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?

The description covers the core action and key side effects, which is good for a simple setter. However, it omits sessionId semantics, the optional nature of value, and error/edge-case behavior, making it not fully complete for an unannotated tool without an output schema.

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 0% schema description coverage, the description must explain all parameters, but it does not mention sessionId at all. It also says 'Set an input cell's value,' implying value is required, while the schema marks value as optional, creating ambiguity about whether a value must be provided.

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 clearly states the primary action: 'Set an input cell's value (any JSON).' It also distinguishes the tool from siblings like session_get_cell and session_define by explicitly mentioning the behavior for computed cells, making the scope and effect unambiguous.

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 useful usage context by explaining that setting a previously-computed cell demotes it to a plain input and that dependents recompute lazily. It implies when the tool is appropriate, though it does not explicitly name alternative tools or exclusions.

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