hash_sha256

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

SHA-256 is the most widely used secure hash algorithm and is recommended for all new applications that require a cryptographic 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": "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"
}

Hash an empty string

The SHA-256 digest of the empty string is a well-known constant and a useful baseline for verifying tool output:

{
	"input": ""
}

Result:

{
	"hash": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
}

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).
• SHA-256 output is deterministic — the same input always produces the same digest.