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devutils-mcp-server

hash_sha1

Generate SHA-1 cryptographic hash values from input strings for data integrity verification and security applications.

Instructions

Generate a SHA-1 hash of the given input string.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
inputYesThe string to hash

Implementation Reference

  • The handler logic for the hash_sha1 MCP tool, including its registration, schema definition (via Zod), and execution logic using node:crypto.
    // SHA-1 hash
    server.tool(
      "hash_sha1",
      "Generate a SHA-1 hash of the given input string.",
      { input: z.string().describe("The string to hash") },
      async ({ input }) => ({
        content: [
          {
            type: "text" as const,
            text: createHash("sha1").update(input).digest("hex"),
          },
        ],
      })
    );
Behavior2/5

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

With no annotations provided, the description carries the full disclosure burden but fails to specify the output format (hex string, base64, or binary) or mention that SHA-1 produces a fixed-length 160-bit output. It also omits any note about the algorithm's deterministic nature or security considerations.

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?

The description is a single, efficient sentence of nine words with the action verb front-loaded. There is no redundant text or unnecessary elaboration, making it immediately scannable.

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

Completeness3/5

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

Given the tool's simplicity (one required string parameter, standard cryptographic operation), the description adequately covers the basic invocation contract. However, it lacks completeness regarding output expectations and algorithm selection context given the rich set of hashing alternatives available.

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?

With 100% schema description coverage for the single 'input' parameter, the baseline score applies. The description confirms the parameter is a string ('input string') but adds no additional semantic context such as encoding requirements, maximum length limits, or whether empty strings are valid.

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

Purpose4/5

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

The description clearly specifies the verb 'Generate' and the exact algorithm 'SHA-1', distinguishing it from generic hashing or sibling tools like hash_md5 and hash_sha256. However, it doesn't elaborate on why an agent should select SHA-1 over stronger alternatives in the sibling list.

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?

The description provides no guidance on when to use SHA-1 versus the numerous sibling hashing algorithms (hash_sha256, hash_bcrypt, hash_md5). There are no prerequisites, warnings about SHA-1's cryptographic weaknesses, or selection criteria provided.

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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