Save a Durable Checkpoint

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

Annotations already flag this as a mutable, non-idempotent operation, and the description adds non-obvious behavior: credential-shaped values are redacted before persistence and the state is tied to session scope and ledger lineage. This is useful context beyond readOnlyHint/idempotentHint and does not contradict annotations.

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 dense sentence with no filler. It front-loads the verb and scope, though 'bounded... bound to' is slightly clunky.

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?

With a full input schema, an output schema, and annotations, the description provides the essential behavioral keywords (redact, persist, session scope, ledger lineage). It is nevertheless terse on usage conditions and leaves the meaning of 'bounded' and 'current ledger lineage' implicit, which is a meaningful gap for a stateful mutation tool.

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 100%, so parameters are already documented. The description contributes only the notion of 'bounded' state and 'session scope', largely echoing the schema's own state/session descriptions; retention_hours and label semantics remain entirely schema-dependent.

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 clear action ('Redact and persist') and a resource ('bounded state object'), adding scope ('session scope', 'current ledger lineage') that helps distinguish save from checkpoint_load. It does not explicitly name a sibling or contrast with other tools, so it stops short of full differentiation.

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?

No guidance is provided for when to use checkpoint_save versus siblings such as checkpoint_load, context_put, or record_outcome. The description implies persistence and scoping but states no conditions, exclusions, or alternative routing.

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