import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
import { runGxi, ERROR_MARKER } from '../gxi.js';
const RESULT_MARKER = 'GERBIL-MCP-VER:';
export function registerVersionTool(server: McpServer): void {
server.registerTool(
'gerbil_version',
{
title: 'Gerbil Environment Info',
description:
'Report Gerbil and Gambit versions, installation path, and system type. ' +
'Useful for diagnostics and ensuring compatibility.',
inputSchema: {},
},
async () => {
const expr = [
'(with-catch',
' (lambda (e)',
` (display "${ERROR_MARKER}\\n")`,
' (display-exception e (current-output-port)))',
' (lambda ()',
` (display "${RESULT_MARKER}gerbil-version\\t")`,
' (display (gerbil-version-string))',
' (newline)',
` (display "${RESULT_MARKER}gambit-version\\t")`,
' (display (system-version-string))',
' (newline)',
` (display "${RESULT_MARKER}gerbil-home\\t")`,
' (display (path-normalize (gerbil-home)))',
' (newline)',
` (display "${RESULT_MARKER}system-type\\t")`,
' (write (system-type))',
' (newline)))',
].join(' ');
const result = await runGxi([expr]);
if (result.timedOut) {
return {
content: [
{
type: 'text' as const,
text: 'Version check timed out.',
},
],
isError: true,
};
}
if (result.exitCode === 127) {
return {
content: [
{
type: 'text' as const,
text: 'gxi not found. Ensure Gerbil is installed and gxi is in PATH.',
},
],
isError: true,
};
}
const stdout = result.stdout;
const errorIdx = stdout.indexOf(ERROR_MARKER);
if (errorIdx !== -1) {
const errorMsg = stdout.slice(errorIdx + ERROR_MARKER.length).trim();
return {
content: [
{
type: 'text' as const,
text: `Error retrieving version info:\n${errorMsg}`,
},
],
isError: true,
};
}
// Parse result lines
const lines = stdout
.split('\n')
.filter((l) => l.startsWith(RESULT_MARKER));
const info: Record<string, string> = {};
for (const line of lines) {
const payload = line.slice(RESULT_MARKER.length);
const tabIdx = payload.indexOf('\t');
if (tabIdx !== -1) {
info[payload.slice(0, tabIdx)] = payload.slice(tabIdx + 1).trim();
}
}
if (Object.keys(info).length === 0) {
return {
content: [
{
type: 'text' as const,
text: 'No version information collected.',
},
],
isError: true,
};
}
const sections: string[] = ['Gerbil Environment', ''];
if (info['gerbil-version']) {
sections.push(`Gerbil version: ${info['gerbil-version']}`);
}
if (info['gambit-version']) {
sections.push(`Gambit version: ${info['gambit-version']}`);
}
if (info['gerbil-home']) {
sections.push(`Gerbil home: ${info['gerbil-home']}`);
}
if (info['system-type']) {
sections.push(`System type: ${info['system-type']}`);
}
return {
content: [{ type: 'text' as const, text: sections.join('\n') }],
};
},
);
}
