diff --git a/packages/opencode-config/plugin/lib/request.ts b/packages/opencode-config/plugin/lib/request.ts
index 90df50fe..5025a501 100644
--- a/packages/opencode-config/plugin/lib/request.ts
+++ b/packages/opencode-config/plugin/lib/request.ts
@@ -1,3 +1,7 @@
+import http from "http"
+import https from "https"
+import { Readable } from "stream"
+
 export type PluginEvent = {
   type: string
   properties?: Record<string, unknown>
@@ -16,7 +20,8 @@ export function getCodeNomadConfig(): CodeNomadConfig {
 }
 
 export function createCodeNomadRequester(config: CodeNomadConfig) {
-  const baseUrl = config.baseUrl.replace(/\/+$/, "")
+  const rawBaseUrl = (config.baseUrl ?? "").trim()
+  const baseUrl = rawBaseUrl.replace(/\/+$/, "")
   const pluginBase = `${baseUrl}/workspaces/${encodeURIComponent(config.instanceId)}/plugin`
   const authorization = buildInstanceAuthorizationHeader()
 
@@ -42,10 +47,10 @@ export function createCodeNomadRequester(config: CodeNomadConfig) {
     const hasBody = init?.body !== undefined
     const headers = buildHeaders(init?.headers, hasBody)
 
-    return fetch(url, {
-      ...init,
-      headers,
-    })
+    // The CodeNomad plugin only talks to the local CodeNomad server.
+    // Use a single request implementation that tolerates custom/self-signed certs
+    // without disabling TLS verification for the whole Node process.
+    return nodeFetch(url, { ...init, headers }, { rejectUnauthorized: false })
   }
 
   const requestJson = async <T>(path: string, init?: RequestInit): Promise<T> => {
@@ -87,6 +92,91 @@ export function createCodeNomadRequester(config: CodeNomadConfig) {
   }
 }
 
+async function nodeFetch(
+  url: string,
+  init: RequestInit & { headers?: Record<string, string> },
+  tls: { rejectUnauthorized: boolean },
+): Promise<Response> {
+  const parsed = new URL(url)
+  const isHttps = parsed.protocol === "https:"
+  const requestFn = isHttps ? https.request : http.request
+
+  const method = (init.method ?? "GET").toUpperCase()
+  const headers = init.headers ?? {}
+  const body = init.body
+
+  return await new Promise<Response>((resolve, reject) => {
+    const req = requestFn(
+      {
+        protocol: parsed.protocol,
+        hostname: parsed.hostname,
+        port: parsed.port ? Number(parsed.port) : undefined,
+        path: `${parsed.pathname}${parsed.search}`,
+        method,
+        headers,
+        ...(isHttps ? { rejectUnauthorized: tls.rejectUnauthorized } : {}),
+      },
+      (res) => {
+        const responseHeaders = new Headers()
+        for (const [key, value] of Object.entries(res.headers)) {
+          if (value === undefined) continue
+          if (Array.isArray(value)) {
+            responseHeaders.set(key, value.join(", "))
+          } else {
+            responseHeaders.set(key, String(value))
+          }
+        }
+
+        // Convert Node stream -> Web ReadableStream for Response.
+        const webBody = Readable.toWeb(res) as unknown as ReadableStream<Uint8Array>
+        resolve(new Response(webBody, { status: res.statusCode ?? 0, headers: responseHeaders }))
+      },
+    )
+
+    const signal = init.signal
+    const abort = () => {
+      const err = new Error("Request aborted")
+      ;(err as any).name = "AbortError"
+      req.destroy(err)
+      reject(err)
+    }
+
+    if (signal) {
+      if (signal.aborted) {
+        abort()
+        return
+      }
+      signal.addEventListener("abort", abort, { once: true })
+      req.once("close", () => signal.removeEventListener("abort", abort))
+    }
+
+    req.once("error", reject)
+
+    if (body === undefined || body === null) {
+      req.end()
+      return
+    }
+
+    if (typeof body === "string") {
+      req.end(body)
+      return
+    }
+
+    if (body instanceof Uint8Array) {
+      req.end(Buffer.from(body))
+      return
+    }
+
+    if (body instanceof ArrayBuffer) {
+      req.end(Buffer.from(new Uint8Array(body)))
+      return
+    }
+
+    // Fallback for less common BodyInit types.
+    req.end(String(body))
+  })
+}
+
 function requireEnv(key: string): string {
   const value = process.env[key]
   if (!value || !value.trim()) {