Base64-encode a string via the executor crypt library

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

Goes well beyond the annotations (readOnlyHint/idempotentHint/destructiveHint), disclosing that it probes both flat and namespaced crypt forms, that a missing crypt table yields { error } rather than throwing, and that the call is pcall-guarded so malformed input degrades cleanly. This is exactly the kind of failure-mode context annotations cannot convey.

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?

Purpose is front-loaded in a strong opening sentence, but the tail is padded with schema-duplicating signature text and annotation-duplicating metadata (idempotency=read-only, Safety: read-only) plus generic filler ('inspect tool-schema for exact fields...'). Roughly half the text is redundant boilerplate.

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 no output schema, the description compensates by naming the return shapes ({ encoded } or { error }) and the failure path, and it states the active-client requirement. It is essentially complete for a simple read-only compute tool, with only the boilerplate tail adding noise rather than substance.

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 schema already documents data, timeoutMs, and threadContext fully. The description repeats the signature but adds no syntax, format, or constraint meaning beyond what the schema provides, 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 (encode) and resource (string to Base64) and names the underlying mechanism (executor `crypt` library), which cleanly distinguishes it from the sibling crypt-base64-decode. An agent can identify the operation without opening the schema.

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 through its purpose and metadata (Phase: observe, Requires: active-client), but never states when to reach for this tool versus alternatives like crypt-hash or execute. There is no explicit when-to-use/when-not guidance, so usage is only implied.

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