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

Annotations already declare readOnly, idempotent, and non-destructive, so the safety profile is covered. The description adds real behavioral context beyond that: the stored blob is encrypted and decryption must happen client-side, which tells the agent not to expect plaintext back. It does not mention auth (though the schema covers api_key).

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?

One tight sentence with the operation front-loaded and the encryption caveat compactly parenthesized. Every clause 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 simple 2-param read with no output schema and full schema coverage, the description supplies enough: what it fetches, from where, and that the payload is encrypted. A note on error behavior for a missing blob would make it fully complete, but nothing essential is missing.

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 both 'name' and 'api_key' are documented in the schema itself. The description adds no syntax, format, or path details beyond it, so the baseline 3 applies.

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 (Fetch) and resource (an encrypted blob from your private house), which clearly distinguishes it from house_list, house_put, and house_delete in the sibling set. It stops short of naming an alternative, but the house_* family makes the resource 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?

Usage is implied by the verb and the 'private house' framing, but the description never states when to use this versus house_list (enumerate) or house_put (upload). No prerequisites or preconditions are given beyond the implicit existing blob name.

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