session_checkpoint

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

With no annotations, the description carries the burden of disclosing behavior. It states the tool creates a checkpoint, returns an ID, and stores recent captures as a snapshot, which is useful. However, it does not mention side effects, overwrite behavior, persistence details, or whether existing checkpoints with the same name are affected.

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 primary action, and contains no filler. Every clause adds relevant information about purpose, return value, or storage behavior.

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 simple two-parameter tool with no output schema, the description covers the core purpose, the return value, and the persistence behavior. It could be more complete by explaining what happens on name collision or how the checkpoint is resumed, but the essential context is present.

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 100%, so the baseline is 3. The description adds minimal semantic value beyond the schema, only reinforcing that the checkpoint is a named snapshot. It does not elaborate on how the summary parameter is used or how the name relates to the returned ID.

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 tool creates a checkpoint of the current session state, returns a checkpoint ID, and stores recent captures as a named snapshot. This specific verb+resource framing distinguishes it from sibling tools like capture or session_start.

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 implies usage by mentioning the checkpoint ID can be used to resume later, but it does not explicitly state when to use this tool versus alternatives like capture, consolidate, or session_end. No exclusions or alternative recommendations are provided.

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