🐛 CLAUDE CODE MCP PARAMETER BUG REPRODUCTION SCRIPT
CRITICAL BUG: Claude Code fails to pass parameters when schema contains union types with null defaults combined with required fields.
🎯 EXACT BUG TRIGGER:
Schema pattern: {"type": ["string", "null"], "default": null} + required fields
Result: Claude Code sends {} instead of actual parameters
🐛 CLAUDE CODE MCP PARAMETER BUG REPRODUCTION SCRIPT
CRITICAL BUG: Claude Code fails to pass parameters when schema contains union types with null defaults combined with required fields.
🎯 EXACT BUG TRIGGER: Schema pattern: {"type": ["string", "null"], "default": null} + required fields Result: Claude Code sends {} instead of actual parameters
| { | |
| inputs = { | |
| # NIX BASE # | |
| nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable"; | |
| clan-core = { | |
| url = "git+https://git.clan.lol/clan/clan-core"; | |
| # Don't do this if your machines are on nixpkgs stable. | |
| inputs.nixpkgs.follows = "nixpkgs"; # https://git.clan.lol/clan/clan-core/issues/3079 | |
| }; | |
| }; |
| import qs from 'npm:qs'; | |
| /* | |
| ex: | |
| var config = { | |
| server:'http://example.org', | |
| path:'/sites/all/modules/civicrm/extern/rest.php', | |
| key:'your key from settings.civicrm.php', | |
| api_key:'the user key' | |
| }; |
| // Adapt all occurrences of `EXAMPLE.org` and `REPLACEME` with the correct values | |
| D("EXAMPLE.org", REG_MY_PROVIDER, DnsProvider(DSP_MY_PROVIDER), | |
| // other records - e.g. | |
| //A("@", "1.2.3.4"), | |
| //////////// | |
| // MIGADU // | |
| //////////// | |
| TXT("@", "hosted-email-verify=REPLACEME"), |
| #!/usr/bin/env bash | |
| set -euo pipefail | |
| # Docs: https://direnv.net/ | |
| if ! has nix_direnv_version || ! nix_direnv_version 2.3.0; then | |
| source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.3.0/direnvrc" "sha256-Dmd+j63L84wuzgyjITIfSxSD57Tx7v51DMxVZOsiUD8=" | |
| fi | |
| nix_direnv_watch_file devenv.nix |
Instead of
{
"editor.fontLigatures" = true;
"editor.inlayHints.enabled" = "offUnlessPressed";
"editor.inlayHints.fontSize" = 12;
}I want to be able to write
| import React, { FC, useState } from 'react'; | |
| const Component = () => { | |
| const [barFoo, setBarFoo] = useState(1); | |
| return <Foo bar={[barFoo, setBarFoo]} />; | |
| }; | |
| const Foo: FC<{ bar: StateRef<number> }> = ({ ...state }) => { | |
| const [bar, setBar] = state.bar; | |
| return <div />; |
| const _ = require('lodash') | |
| const sanitize = str => _.chain(str) | |
| .replace(/[^A-Za-z0-9&.-]/g, '-') // sanitise via whitelist of characters | |
| .replace(/-(?=-)/g, '') // remove repeated dashes - https://regexr.com/6ag8h | |
| .trim('-') // trim any leading/trailing dashes | |
| .truncate({ | |
| length: 40, // max length | |
| omission: '-' // when the string ends with '-', you'll know it was truncated | |
| }) |
| # basic bash command | |
| wget $(curl -s https://api.github.com/repos/filiph/linkcheck/releases/latest \ | |
| | jq -r '.assets | .[] | select(.name|contains("linux-x64.tar.gz")) | .browser_download_url') |