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#!/usr/bin/env bash
set -euo pipefail
tmp="$(mktemp -d)"
trap 'rm -rf "$tmp"' EXIT
cd "$tmp"
cat > mcp.json <<'JSON'
{
"mcpServers": {
"panto-test": {
"command": "node",
"args": ["server.js"]
}
}
}
JSON
cat > server.js <<'JS'
#!/usr/bin/env node
const readline = require("readline");
const rl = readline.createInterface({ input: process.stdin });
function send(message) {
process.stdout.write(JSON.stringify(message) + "\n");
}
rl.on("line", (line) => {
let message;
try {
message = JSON.parse(line);
} catch {
return;
}
if (message.method === "initialize") {
send({
jsonrpc: "2.0",
id: message.id,
result: {
protocolVersion: "2024-11-05",
capabilities: { tools: {} },
serverInfo: { name: "panto-test", version: "0.0.1" }
}
});
} else if (message.method === "notifications/initialized") {
// No response for notifications.
} else if (message.method === "tools/list") {
send({
jsonrpc: "2.0",
id: message.id,
result: {
tools: [
{
name: "ping",
description: "Return pong-from-mcp",
inputSchema: {
type: "object",
properties: {},
additionalProperties: false
}
}
]
}
});
} else if (message.method === "tools/call") {
send({
jsonrpc: "2.0",
id: message.id,
result: {
content: [{ type: "text", text: "pong-from-mcp" }]
}
});
} else if (message.id !== undefined) {
send({ jsonrpc: "2.0", id: message.id, result: {} });
}
});
JS
chmod +x server.js
cat >&2 <<'EOF'
Starting Claude with built-in tools disabled and one MCP tool enabled.
Manual test prompt:
call the ping MCP tool
Expected useful result:
pong-from-mcp
If Claude says no tools are available, --tools "" also disables MCP tools.
EOF
unset ANTHROPIC_API_KEY
exec claude \
--tools "" \
--strict-mcp-config \
--mcp-config mcp.json \
--disable-slash-commands \
--no-chrome \
--system-prompt 'If tool mcp__panto-test__ping exists, call it when asked. Otherwise say unavailable.'
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