Hash strings with SHA-3, Blake2, and 8 other algorithms (10 algos × 3 encodings) via @mukundakatta/hash-mcp (npx)

Recipe: multi-algorithm hashing via @mukundakatta/hash-mcp

Package: @mukundakatta/hash-mcp v0.1.0 (npm) Install: npm install --prefix /tmp/hash-mcp @mukundakatta/hash-mcp Entry: node node_modules/@mukundakatta/hash-mcp/dist/server.js Transport: stdio (MCP SDK StdioClientTransport) Auth: none — credential-free, zero config

Tool inventory (1 tool, 10 algorithms × 3 encodings = 30 combos)

Supported algorithms: sha256, sha384, sha512, sha3-256, sha3-384, sha3-512, blake2b512, blake2s256, md5, sha1

Supported encodings: hex, base64, base64url

Verified traces (10 calls, 100% success, p50=0.5ms)

1. SHA3-256 — "hello world"

→ hash({text: "hello world", algo: "sha3-256"})
← {algo: "sha3-256", encoding: "hex", hash: "644bcc7e564373040999aac89e7622f3ca71fba1d972fd94a31c3bfbf24e3938"}
  (1ms) ✓ cross-verified against openssl dgst -sha3-256

2. SHA3-512 — "hello world"

→ hash({text: "hello world", algo: "sha3-512"})
← {algo: "sha3-512", encoding: "hex", hash: "840006653e9ac9e95117a15c915caab81662918e925de9e004f774ff82d7079a40d4d27b1b372657c61d46d470304c88c788b3a4527ad074d1dccbee5dbaa99a"}
  (0ms)

3. Blake2b-512 — "hello world"

→ hash({text: "hello world", algo: "blake2b512"})
← {algo: "blake2b512", encoding: "hex", hash: "021ced8799296ceca557832ab941a50b4a11f83478cf141f51f933f653ab9fbcc05a037cddbed06e309bf334942c4e58cdf1a46e237911ccd7fcf9787cbc7fd0"}
  (1ms)

4. Blake2s-256 — "hello world"

→ hash({text: "hello world", algo: "blake2s256"})
← {algo: "blake2s256", encoding: "hex", hash: "9aec6806794561107e594b1f6a8a6b0c92a0cba9acf5e5e93cca06f781813b0b"}
  (0ms)

5. SHA-256 — cross-verify

→ hash({text: "hello world", algo: "sha256"})
← {algo: "sha256", encoding: "hex", hash: "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"}
  (0ms) ✓ cross-verified against shasum -a 256

6. SHA-256 base64 encoding

→ hash({text: "hello world", algo: "sha256", encoding: "base64"})
← {algo: "sha256", encoding: "base64", hash: "uU0nuZNNPgilLlLX2n2r+sSE7+N6U4DukIj3rOLvzek="}
  (1ms)

7. SHA-256 base64url encoding

→ hash({text: "hello world", algo: "sha256", encoding: "base64url"})
← {algo: "sha256", encoding: "base64url", hash: "uU0nuZNNPgilLlLX2n2r-sSE7-N6U4DukIj3rOLvzek"}
  (0ms) — note: no padding, +/→-_

8. SHA3-256 with Unicode

→ hash({text: "merhaba dünya 🌍", algo: "sha3-256"})
← {algo: "sha3-256", encoding: "hex", hash: "9e06e9de48ad76e7562c861fe4fd8af4113f47e766c7414fa8b57417c003ee39"}
  (1ms)

9. SHA-256 empty string — well-known hash

→ hash({text: "", algo: "sha256"})
← {algo: "sha256", encoding: "hex", hash: "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"}
  (0ms) ✓ well-known empty SHA-256

10. MD5 — "hello world"

→ hash({text: "hello world", algo: "md5"})
← {algo: "md5", encoding: "hex", hash: "5eb63bbbe01eeed093cb22bb8f5acdc3"}
  (0ms) ✓ cross-verified against system md5

Key gotchas

• ⚠️ Param is `algo` NOT `algorithm` — using algorithm is silently ignored, falls back to sha256 default. This is the #1 trap: every call appears to succeed but returns the wrong hash.
• No `hash_file` or `list_algorithms` tools — despite what you might expect, the only tool is hash for strings. For file hashing, read the file first and pass its contents.
• No xxHash or Blake3 — despite the package description mentioning "xxhash" and "blake3", the actual enum only includes sha2/sha3/blake2/md5/sha1.
• Sub-millisecond after JIT — first call ~2ms, all subsequent calls 0-1ms. Blazing fast.
• Deterministic — same input + algo + encoding always produces the same hash.
• Unicode-safe — handles e