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

Annotations already cover non-destructive, read-only, idempotent behavior. The description adds useful context beyond annotations: it guarantees identity/body persistence across sessions, mentions the accumulated turn count, and states the returned inline living-body view. No contradictions.

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?

Two focused sentences with zero redundancy. The core behavior and usage context are front-loaded, and the return-value summary earns its place.

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 single-parameter read tool with rich annotations, the description is complete: it explains what is returned, when to invoke it, and how the operation differs from creation. No output schema exists, but the description explicitly enumerates the returned fields.

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%, and the sole parameter persona_id is already well-described in the schema as returned by create_agent_persona. The description does not add meaningful parameter-level detail beyond restating 'by its persona_id,' so baseline 3 is appropriate.

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?

States a specific verb ('bring back') and resource ('previously saved persona by its persona_id'), and clarifies the key distinction from creating a persona: the SAME body and identity in a fresh session. It is clearly differentiated from create_agent_persona and other siblings.

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?

Explicitly tells the agent when to use it: 'at the start of a conversation when the user returns to a named agent.' It does not explicitly name an alternative or exclusion, but the continuity context strongly implies this is the reload counterpart to create_agent_persona.

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