hash_blake3

Compute the BLAKE3 (256-bit) hash of a UTF-8 string. Returns a 64-character lowercase hexadecimal digest.

BLAKE3 is a modern cryptographic hash function that is significantly faster than SHA-256 and SHA-512 on modern hardware while providing equivalent security guarantees. It is suitable for all new applications that require a secure hash.

Parameters

Parameter	Type	Required	Description
input	string	Yes	The UTF-8 string to hash.

Response

Field	Type	Description
hash	string	Lowercase hexadecimal digest.

Examples

Hash a non-empty string

{
	"input": "hello world"
}

Result:

{
	"hash": "d74981efa70a0c880b8d8c1985d075dbcbf679b99a5f9914e5aaf96b831a9e24"
}

Hash an empty string

The BLAKE3 digest of the empty string is a well-known constant and a useful baseline for verifying tool output:

{
	"input": ""
}

Result:

{
	"hash": "af1349b9f5f9a1a6a0404dea36dcc9499bcb25c9adc112b7cc9a93cae41f3262"
}

Errors

Each failure carries a precise code in the response. Argument-schema and server errors are JSON-RPC protocol errors; a rejected value is returned as a tool result with isError: true (so the agent can read the code and self-correct).

Code	When	Delivered as
invalid_arguments	The input field is missing or not a string.	protocol error (invalid_params)
internal_error	An unexpected server error.	protocol error (internal_error)

Notes

• The input is always treated as a UTF-8 string. If you need to hash raw bytes, hex-encode them first.
• The digest is always 64 lowercase hex characters (256 bits).
• BLAKE3 output is deterministic — the same input always produces the same digest.
• BLAKE3 is the recommended choice when raw throughput matters (e.g. hashing large strings or running many hashes in sequence).