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sha1

Generate a SHA-1 hash from any input string to verify data integrity or produce a fixed-length digest for cryptographic operations.

Instructions

Calculate SHA-1 hash of a string

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
inputYesThe input string to hash

Implementation Reference

  • The DigestUtil.sha1() static method that computes the SHA-1 hash using CryptoJS.SHA1().
    static sha1(input: string): string {
      const hash = CryptoJS.SHA1(input);
      return hash.toString();
    }
  • Input schema for the sha1 tool: a single string parameter 'input' described as 'The input string to hash'.
    {
      input: z.string().describe("The input string to hash"),
  • Registration of 'sha1' tool via server.tool() with name, description, input schema, and handler callback.
    // Register SHA-1 tool
    server.tool(
      "sha1",
      "Calculate SHA-1 hash of a string",
      {
        input: z.string().describe("The input string to hash"),
      },
      ({ input }) => {
        const hash = DigestUtil.sha1(input);
        return {
          content: [{ type: "text", text: hash }],
        };
      }
    );
  • src/index.ts:16-16 (registration)
    Top-level call to registerDigestTool(server) which registers the sha1 tool among other digest tools.
    registerDigestTool(server);
Behavior2/5

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

The description states 'calculate hash' but does not disclose key behavioral details such as the output format (e.g., hex string), input encoding assumptions, or security status. With no annotations, the description should provide more context.

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, concise sentence that immediately conveys the tool's purpose with no extraneous information.

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?

For a simple 1-parameter tool with no output schema, the description is minimally adequate but lacks details on output format and encoding, which are important for correct invocation.

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?

The input schema already describes the single parameter 'input' as 'The input string to hash', covering 100% of the schema. The description adds no additional meaning beyond what the schema provides, so the baseline score of 3 applies.

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?

The description clearly states the tool calculates SHA-1 hash of a string, using a specific verb and resource. It distinguishes from sibling tools that compute other hash functions like md5 or sha256.

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?

No guidance is provided on when to use SHA-1 versus alternatives like SHA-256. The description does not mention security concerns (SHA-1 is deprecated) or any prerequisites, leaving the agent without context for appropriate selection.

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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