Formatho MCP server

• Registry namecom.formatho/runtimeverified in the MCP registry

The registry name sits under formatho.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-10-19
• Tools26
• Server calls itselfformatho-runtime
• Server version0.3.0
• Protocol version2025-06-18

On 2026-10-19 the server answered initialize and tools/list without a sign-in. First answer in 440 ms.

• Answeredmeasuring2 of the 7 daily checks it takes to print a share
• Median first answer402 ms
• Space in an agent's context≈ 2,823 tokensthe definitions of all its tools (26), which an agent carries on every turn
• Tool definitionsC · 67 of 100

• Parameters without a description: in 25 of 26
• Not saying whether it only reads or can destroy: 26 of 26

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The state of vendors' MCP servers: method and numbers →

• json.format

  Validate and pretty-print JSON with a configurable indent level. [data · v1.0.0 · deterministic: true · permissions: none]

• json.minify

  Validate JSON and strip all insignificant whitespace. [data · v1.0.0 · deterministic: true · permissions: none]

• json.validate

  Validate JSON and report the parse error position if invalid. [data · v1.0.0 · deterministic: true · permissions: none]

• base64.encode

  Base64-encode text (standard alphabet). [data · v1.0.0 · deterministic: true · permissions: none]

• base64.decode

  Base64-decode to text. [data · v1.0.0 · deterministic: true · permissions: none]

• url.encode

  Percent-encode text (component encoding). [network · v1.0.0 · deterministic: true · permissions: none]

• url.decode

  Decode percent-encoded text. [network · v1.0.0 · deterministic: true · permissions: none]

• slug.generate

  Convert text to a URL-safe kebab-case slug. [dev · v1.0.0 · deterministic: true · permissions: none]

• hash.text

  Hash text with md5/sha1/sha256/sha384/sha512 (hex output). MD5/SHA1 are for compatibility checks only, not security. [security · v1.0.0 · deterministic: true · permissions: none]

• uuid.v4

  Generate random UUID v4 values. [security · v1.0.0 · deterministic: false · permissions: none]

• random.string

  Generate a cryptographically random alphanumeric string. [security · v1.0.0 · deterministic: false · permissions: none]

• jwt.decode

  Decode a JWT (JWS compact serialization) header and claims WITHOUT verifying the signature. Reports expiry status from the exp claim. [security · v1.0.0 · deterministic: true · permissions: none]

• evm.keccak256

  Keccak-256 (Ethereum flavor, NOT NIST SHA3-256) of arbitrary hex or text. [web3 · v1.0.0 · deterministic: true · permissions: none]

• evm.function_selector

  Compute the 4-byte function selector from a canonical signature, with reverse lookup against common signatures. [web3 · v1.0.0 · deterministic: true · permissions: none]

• evm.create2_address

  Compute the deterministic CREATE2 address: keccak256(0xff ‖ factory ‖ salt ‖ initCodeHash)[12:]. [web3 · v1.0.0 · deterministic: true · permissions: none]

• evm.storage_slot

  Compute Solidity storage slots: simple variables, mapping values (keccak(key ‖ p)), and dynamic array elements (keccak(p) + index). [web3 · v1.0.0 · deterministic: true · permissions: none]

• evm.decode_calldata

  Extract the 4-byte selector from raw calldata, match it against common signatures, and decode static (word-based) arguments: address, uint256, int256, bytes32, bool. [web3 · v1.0.0 · deterministic: true · permissions: none]

• evm.v4_hook_permissions

  Uniswap v4 hook permissions: compute the 14-bit permission field from hook-call names, or decode the field from a hook address (bits live in the LOW 14 bits: address & 0x3FFF). [web3 · v1.0.0 · deterministic: true · permissions: none]

• erc4626.math

  Exact EIP-4626 vault math in BigInt: convert assets to shares (round down) and shares to assets (round down), with optional virtual offsets. [defi · v1.0.0 · deterministic: true · permissions: none]

• timestamp.convert

  Convert Unix seconds/milliseconds to ISO 8601 (UTC) and back. [dev · v1.0.0 · deterministic: true · permissions: none]

• regex.test

  Test a regular expression against text: match result plus all capture groups. [dev · v1.0.0 · deterministic: true · permissions: none]

• case.convert

  Convert an identifier between camelCase, snake_case, kebab-case, CONSTANT_CASE, and Title Case. [dev · v1.0.0 · deterministic: true · permissions: none]

• hex.encode

  Encode text to hex, or decode hex (with or without 0x) to text. [data · v1.0.0 · deterministic: true · permissions: none]

• evm.checksum_address

  EIP-55 checksum an Ethereum address, or verify a checksummed one. [web3 · v1.0.0 · deterministic: true · permissions: none]

• evm.unit_convert

  Convert EVM amounts between wei, gwei, and ether with exact BigInt math. [web3 · v1.0.0 · deterministic: true · permissions: none]

• formatho.registry

  List every registered Formatho tool with version, category, deterministic flag, permissions, and Formatho Verified status. [meta · v1.0.0 · deterministic: true · permissions: none]