proxy-mcp

Instructions

Implementation Reference

• src/tools/modification.ts:56-96 (handler)

  The tool 'proxy_rewrite_url' is registered and implemented in src/tools/modification.ts. It configures a passthrough rule that applies a match-replace transformation on the request URL.

  server.tool(
    "proxy_rewrite_url",
    "Rewrite request URLs matching a pattern. Creates a passthrough rule with body match-replace on the URL.",
    {
      match_pattern: z.string().describe("Regex pattern to match in URLs"),
      replace_with: z.string().describe("Replacement string"),
      hostname: z.string().optional().describe("Limit to this hostname"),
      priority: z.number().optional().default(50).describe("Rule priority (default: 50)"),
    },
    async ({ match_pattern, replace_with, hostname, priority }) => {
      try {
        const matcher: RuleMatcher = {};
        if (hostname) matcher.hostname = hostname;
        matcher.urlPattern = match_pattern;
  
        const handler: RuleHandler = {
          type: "passthrough",
          transformRequest: {
            matchReplaceBody: [[match_pattern, replace_with]],
          },
        };
  
        const rule = await proxyManager.addRule({
          priority,
          enabled: true,
          description: `URL rewrite: ${match_pattern} → ${replace_with}`,
          matcher,
          handler,
        });
  
        return {
          content: [{
            type: "text",
            text: JSON.stringify({ status: "success", rule_id: rule.id, description: rule.description }),
          }],
        };
      } catch (e) {
        return { content: [{ type: "text", text: JSON.stringify({ status: "error", error: String(e) }) }] };
      }
    },
  );