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

No annotations exist, so the description carries the full burden. It does disclose a genuinely useful behavioral detail: the private key 'is used for this call only', which reassures an agent about credential handling. It does not disclose permissions required to append to a given eid, whether appends are idempotent, what happens if kind is supplied without payload (or vice versa), or any limits beyond the schema's maxItems.

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 tight sentences with the action front-loaded and the mode split in the second sentence. Every clause adds information; nothing is redundant.

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 5-parameter mutation tool with no annotations and no output schema, the description is thin. The required eid is never explained (a reader must guess it comes from openentity_self/openentity_find), and the six kind enum values are not characterized. The payload description's pointer to openentity_read topic=spec section=7 partially offsets this by delegating detail.

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 only 40% and no param is explained in the schema beyond 'Signed RecordEntry objects' and the spec pointer for payload. The description compensates by explaining the mutual-exclusion relationship between the entries path and the kind+payload+private_key_jwk path, which the schema cannot express. It omits eid entirely, so not a 5.

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 and resource ('Append entries to your Development Record') and immediately distinguishes two operating modes: supplying pre-signed entries versus supplying kind/payload for server-side signing. It doesn't explicitly contrast itself with siblings like openentity_verify or openentity_read, but 'append' vs 'read' is inferable.

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 two calling modes ('Pass signed entries, or kind and payload plus your private_key_jwk'), which is real usage guidance for choosing between paths. However, it gives no when-to-use/when-not-to-use guidance relative to sibling tools (e.g. when to use this versus openentity_verify after writing), and no prerequisites such as needing an eid from openentity_self.

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