feat(mcp): reconnect failed MCP servers in managed OpenCode

OpenCode marks an MCP server failed when it does not come up at startup or when a live connection drops, and never retries. A new managed plugin reconnects those servers with a per-server backoff (1s doubling to a 30s cap), wakes early on mcp.tools.changed, and stops on dispose. Only the failed state is retried; disabled and auth states stay untouched. The OPENCODE_CONFIG_CONTENT merge that agent-tool and system-prompt each carried is now one shared helper so the three managed plugins compose. Claude-Session: https://claude.ai/code/session_01VqV56Hez25hTxXH4ipJfzH
2026-09-04 22:56:27 +03:00
parent caac24ac3d
commit ce5c0c068e
8 changed files with 375 additions and 45 deletions
@@ -0,0 +1,35 @@
+import { parse as parseJsonc } from 'jsonc-parser';
+
+const isJsonObject = (value) => value !== null && value !== undefined && Object.getPrototypeOf(value) === Object.prototype;
+
+/**
+ * Append a managed OpenChamber plugin to the `plugin` list of an
+ * `OPENCODE_CONFIG_CONTENT` value.
+ *
+ * Existing entries are preserved; an earlier entry for the same URL is dropped
+ * so a restart never registers the same plugin twice. Every managed plugin
+ * (agent tools, system prompt optimizer, MCP reconnect) goes through this one
+ * merge so they compose in any order.
+ *
+ * @param {string | undefined} rawConfig the current `OPENCODE_CONFIG_CONTENT`, JSONC or unset
+ * @param {string} pluginUrl `file://` URL of the materialized plugin
+ * @param {string} purpose short noun phrase for the error message, e.g. "managed tool"
+ * @returns {string} the merged config as JSON
+ */
+export const appendManagedPlugin = (rawConfig, pluginUrl, purpose) => {
+  const errors = [];
+  const text = (rawConfig ?? '').trim();
+  const parsed = text ? parseJsonc(text, errors, { allowTrailingComma: true }) : {};
+  if (errors.length > 0 || !isJsonObject(parsed)) {
+    throw new Error(`OPENCODE_CONFIG_CONTENT must contain a valid JSON object before OpenChamber can inject its ${purpose}`);
+  }
+  if (parsed.plugin !== undefined && !Array.isArray(parsed.plugin)) {
+    throw new Error(`OPENCODE_CONFIG_CONTENT plugin must be an array before OpenChamber can inject its ${purpose}`);
+  }
+  const configured = Array.isArray(parsed.plugin) ? parsed.plugin : [];
+  parsed.plugin = [
+    ...configured.filter((value) => value !== pluginUrl && (!Array.isArray(value) || value[0] !== pluginUrl)),
+    pluginUrl,
+  ];
+  return JSON.stringify(parsed);
+};