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devutils-mcp-server

hash_sha256

Generate SHA-256 cryptographic hash values from input strings for data verification and security applications.

Instructions

Generate a SHA-256 hash of the given input string.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
inputYesThe string to hash

Implementation Reference

  • The tool 'hash_sha256' is registered and implemented directly within the registerHashTools function using the node:crypto library.
    server.tool(
      "hash_sha256",
      "Generate a SHA-256 hash of the given input string.",
      { input: z.string().describe("The string to hash") },
      async ({ input }) => ({
        content: [
          {
            type: "text" as const,
            text: createHash("sha256").update(input).digest("hex"),
          },
        ],
      })
    );
Behavior3/5

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

No annotations provided, so description carries full burden. Explains the hashing action but omits behavioral details like output format (hex string vs base64) and determinism, which are important given no output schema exists.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Single sentence with zero waste. Action-oriented and front-loaded with the verb. Appropriate length for the tool's complexity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Adequate for a simple single-parameter utility with complete schema coverage. Minor gap: lacking output format specification (given no output schema exists), though 'SHA-256 hash' implies standard hex encoding.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema has 100% description coverage ('The string to hash'). Description references 'input string' which aligns with schema but adds no additional semantics, syntax constraints, or examples beyond the schema baseline.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States specific verb (Generate), resource (SHA-256 hash), and scope (input string). Explicitly names the algorithm, distinguishing it from siblings like hash_md5, hash_sha1, and hash_bcrypt.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides no guidance on when to prefer SHA-256 over siblings (e.g., hash_md5 for checksums, hash_bcrypt for passwords) or security considerations. No explicit when-not-to-use or alternatives mentioned.

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

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