toolkit-mcp-server: encode value

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

The annotations already supply readOnlyHint and idempotentHint, and the description adds strong behavioral context beyond that: base64url alphabet substitution, encodeURIComponent/decodeURIComponent semantics, and recoverable-error behavior for malformed decodes. This tells the agent exactly what to expect without contradicting 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?

Three focused sentences: the first states scope, the second explains operation semantics, and the third adds essential encoding-specific and error behavior. No filler, repetition of schema fields, or unnecessary detail.

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 stateless encode/decode utility with an output schema and fully documented parameters, this is complete: it covers all four encodings, both directions, and the failure mode. Nothing necessary for correct invocation 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?

All three parameters are fully described in the schema (100% coverage), so the baseline is 3. The description adds extra practical meaning for encoding ('base64url uses the URL-safe alphabet', 'url applies encodeURIComponent / decodeURIComponent') and clarifies that value is raw text for encode vs an encoded string for decode, warranting a 4.

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+resource: encode or decode a value across four named encodings, in either direction. This clearly distinguishes it from siblings like hashing, ID generation, QR generation, and IP geolocation without needing to inspect them.

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?

Provides explicit operation-level guidance: set operation to "encode" or "decode" depending on the desired direction, with clear expectations for each. It does not name alternative tools or exclusion criteria, so sibling differentiation is implicit by domain rather than explicitly stated.

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