com.formatho/runtime

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Self-hosted MCP server: 26 deterministic dev, security, and EVM tools.

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Copy this into your MCP client config:

{
  "mcpServers": {
    "runtime": {
      "url": "https://mcp.formatho.com/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (26)

• json.format

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

  Parameters:

  • json (required) — string
  • indent — integer

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• json.minify

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

  Parameters:

  • json (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• json.validate

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

  Parameters:

  • json (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• base64.encode

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

  Parameters:

  • text (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• base64.decode

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

  Parameters:

  • base64 (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• url.encode

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

  Parameters:

  • text (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• url.decode

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

  Parameters:

  • text (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• slug.generate

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

  Parameters:

  • text (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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]

  Parameters:

  • text (required) — string
  • algorithm — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• uuid.v4

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

  Parameters:

  • count — integer

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• random.string

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

  Parameters:

  • length — integer

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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]

  Parameters:

  • token (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• evm.keccak256

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

  Parameters:

  • data (required) — string
  • encoding — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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]

  Parameters:

  • selector — string
  • signature — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• evm.create2_address

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

  Parameters:

  • factory (required) — string
  • salt (required) — string
  • initCodeHash (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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]

  Parameters:

  • baseSlot (required) — integer
  • kind — string
  • keyHex — string
  • arrayIndex — integer

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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]

  Parameters:

  • calldata (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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]

  Parameters:

  • calls — array
  • address — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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]

  Parameters:

  • totalAssets (required) — string
  • totalSupply (required) — string
  • amount (required) — string
  • direction — string
  • virtualAssets — string
  • virtualShares — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• timestamp.convert

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

  Parameters:

  • iso — string
  • value — ['string', 'number']

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• regex.test

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

  Parameters:

  • pattern (required) — string
  • text (required) — string
  • flags — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• case.convert

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

  Parameters:

  • text (required) — string
  • to — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• hex.encode

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

  Parameters:

  • hex — string
  • text — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• evm.checksum_address

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

  Parameters:

  • address (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• evm.unit_convert

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

  Parameters:

  • value (required) — string
  • to — string
  • from — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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]

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.