refactor(index): extract config loading and handlers to reduce file size

Reduce index.ts from 724 to 458 lines (37% reduction):
- Extract config loading to plugin-config.ts
- Extract ModelCacheState to plugin-state.ts
- Extract config handler to plugin-handlers/config-handler.ts

All 408 tests pass, TypeScript typecheck clean.

🤖 Generated with assistance of OhMyOpenCode (https://github.com/code-yeongyu/oh-my-opencode)

src/index.ts

@@ -1,5 +1,4 @@
 import type { Plugin } from "@opencode-ai/plugin";
-import { createBuiltinAgents } from "./agents";
 import {
   createTodoContinuationEnforcer,
   createContextWindowMonitorHook,
@@ -29,17 +28,6 @@ import {
 } from "./hooks";
 import { createGoogleAntigravityAuthPlugin } from "./auth/antigravity";
 import {
-  loadUserCommands,
-  loadProjectCommands,
-  loadOpencodeGlobalCommands,
-  loadOpencodeProjectCommands,
-} from "./features/claude-code-command-loader";
-import { loadBuiltinCommands } from "./features/builtin-commands";
-import {
-  loadUserSkills,
-  loadProjectSkills,
-  loadOpencodeGlobalSkills,
-  loadOpencodeProjectSkills,
   discoverUserClaudeSkills,
   discoverProjectClaudeSkills,
   discoverOpencodeGlobalSkills,
@@ -47,44 +35,35 @@ import {
   mergeSkills,
 } from "./features/opencode-skill-loader";
 import { createBuiltinSkills } from "./features/builtin-skills";
-
-import {
-  loadUserAgents,
-  loadProjectAgents,
-} from "./features/claude-code-agent-loader";
-import { loadMcpConfigs, getSystemMcpServerNames } from "./features/claude-code-mcp-loader";
-import { loadAllPluginComponents } from "./features/claude-code-plugin-loader";
+import { getSystemMcpServerNames } from "./features/claude-code-mcp-loader";
 import {
   setMainSession,
   getMainSessionID,
 } from "./features/claude-code-session-state";
-import { builtinTools, createCallOmoAgent, createBackgroundTools, createLookAt, createSkillTool, createSkillMcpTool, interactive_bash, getTmuxPath } from "./tools";
+import {
+  builtinTools,
+  createCallOmoAgent,
+  createBackgroundTools,
+  createLookAt,
+  createSkillTool,
+  createSkillMcpTool,
+  interactive_bash,
+  getTmuxPath,
+} from "./tools";
 import { BackgroundManager } from "./features/background-agent";
 import { SkillMcpManager } from "./features/skill-mcp-manager";
-import { createBuiltinMcps } from "./mcp";
-import { OhMyOpenCodeConfigSchema, type OhMyOpenCodeConfig, type HookName } from "./config";
+import { type OhMyOpenCodeConfig, type HookName } from "./config";
 import { log } from "./shared";
-import { PLAN_SYSTEM_PROMPT, PLAN_PERMISSION } from "./agents/plan-prompt";
 import { loadPluginConfig } from "./plugin-config";
+import { createModelCacheState, getModelLimit } from "./plugin-state";
+import { createConfigHandler } from "./plugin-handlers";
 
 const OhMyOpenCodePlugin: Plugin = async (ctx) => {
   const pluginConfig = loadPluginConfig(ctx.directory, ctx);
   const disabledHooks = new Set(pluginConfig.disabled_hooks ?? []);
   const isHookEnabled = (hookName: HookName) => !disabledHooks.has(hookName);
 
-  const modelContextLimitsCache = new Map<string, number>();
-  let anthropicContext1MEnabled = false;
-
-  const getModelLimit = (providerID: string, modelID: string): number | undefined => {
-    const key = `${providerID}/${modelID}`;
-    const cached = modelContextLimitsCache.get(key);
-    if (cached) return cached;
-
-    if (providerID === "anthropic" && anthropicContext1MEnabled && modelID.includes("sonnet")) {
-      return 1_000_000;
-    }
-    return undefined;
-  };
+  const modelCacheState = createModelCacheState();
 
   const contextWindowMonitor = isHookEnabled("context-window-monitor")
     ? createContextWindowMonitorHook(ctx)
@@ -100,7 +79,9 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
     ? createCommentCheckerHooks(pluginConfig.comment_checker)
     : null;
   const toolOutputTruncator = isHookEnabled("tool-output-truncator")
-    ? createToolOutputTruncatorHook(ctx, { experimental: pluginConfig.experimental })
+    ? createToolOutputTruncatorHook(ctx, {
+        experimental: pluginConfig.experimental,
+      })
     : null;
   const directoryAgentsInjector = isHookEnabled("directory-agents-injector")
     ? createDirectoryAgentsInjectorHook(ctx)
@@ -111,13 +92,13 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
   const emptyTaskResponseDetector = isHookEnabled("empty-task-response-detector")
     ? createEmptyTaskResponseDetectorHook(ctx)
     : null;
-  const thinkMode = isHookEnabled("think-mode")
-    ? createThinkModeHook()
-    : null;
+  const thinkMode = isHookEnabled("think-mode") ? createThinkModeHook() : null;
   const claudeCodeHooks = createClaudeCodeHooksHook(ctx, {
     disabledHooks: (pluginConfig.claude_code?.hooks ?? true) ? undefined : true,
   });
-  const anthropicContextWindowLimitRecovery = isHookEnabled("anthropic-context-window-limit-recovery")
+  const anthropicContextWindowLimitRecovery = isHookEnabled(
+    "anthropic-context-window-limit-recovery"
+  )
     ? createAnthropicContextWindowLimitRecoveryHook(ctx, {
         experimental: pluginConfig.experimental,
         dcpForCompaction: pluginConfig.experimental?.dcp_for_compaction,
@@ -130,7 +111,8 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
     ? createPreemptiveCompactionHook(ctx, {
         experimental: pluginConfig.experimental,
         onBeforeSummarize: compactionContextInjector,
-        getModelLimit,
+        getModelLimit: (providerID, modelID) =>
+          getModelLimit(modelCacheState, providerID, modelID),
       })
     : null;
   const rulesInjector = isHookEnabled("rules-injector")
@@ -178,7 +160,9 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
 
   if (sessionRecovery && todoContinuationEnforcer) {
     sessionRecovery.setOnAbortCallback(todoContinuationEnforcer.markRecovering);
-    sessionRecovery.setOnRecoveryCompleteCallback(todoContinuationEnforcer.markRecoveryComplete);
+    sessionRecovery.setOnRecoveryCompleteCallback(
+      todoContinuationEnforcer.markRecoveryComplete
+    );
   }
 
   const backgroundNotificationHook = isHookEnabled("background-notification")
@@ -191,13 +175,13 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
   const disabledSkills = new Set(pluginConfig.disabled_skills ?? []);
   const systemMcpNames = getSystemMcpServerNames();
   const builtinSkills = createBuiltinSkills().filter((skill) => {
-    if (disabledSkills.has(skill.name as any)) return false
+    if (disabledSkills.has(skill.name as never)) return false;
     if (skill.mcpConfig) {
       for (const mcpName of Object.keys(skill.mcpConfig)) {
-        if (systemMcpNames.has(mcpName)) return false
+        if (systemMcpNames.has(mcpName)) return false;
       }
     }
-    return true
+    return true;
   });
   const includeClaudeSkills = pluginConfig.claude_code?.skills !== false;
   const mergedSkills = mergeSkills(
@@ -206,7 +190,7 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
     includeClaudeSkills ? discoverUserClaudeSkills() : [],
     discoverOpencodeGlobalSkills(),
     includeClaudeSkills ? discoverProjectClaudeSkills() : [],
-    discoverOpencodeProjectSkills(),
+    discoverOpencodeProjectSkills()
   );
   const skillMcpManager = new SkillMcpManager();
   const getSessionIDForMcp = () => getMainSessionID() || "";
@@ -221,12 +205,19 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
     getSessionID: getSessionIDForMcp,
   });
 
-  const googleAuthHooks = pluginConfig.google_auth !== false
-    ? await createGoogleAntigravityAuthPlugin(ctx)
-    : null;
+  const googleAuthHooks =
+    pluginConfig.google_auth !== false
+      ? await createGoogleAntigravityAuthPlugin(ctx)
+      : null;
 
   const tmuxAvailable = await getTmuxPath();
 
+  const configHandler = createConfigHandler({
+    ctx,
+    pluginConfig,
+    modelCacheState,
+  });
+
   return {
     ...(googleAuthHooks ? { auth: googleAuthHooks.auth } : {}),
 
@@ -246,34 +237,54 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
       await autoSlashCommand?.["chat.message"]?.(input, output);
 
       if (ralphLoop) {
-        const parts = (output as { parts?: Array<{ type: string; text?: string }> }).parts;
-        const promptText = parts
-          ?.filter((p) => p.type === "text" && p.text)
-          .map((p) => p.text)
-          .join("\n")
-          .trim() || "";
+        const parts = (
+          output as { parts?: Array<{ type: string; text?: string }> }
+        ).parts;
+        const promptText =
+          parts
+            ?.filter((p) => p.type === "text" && p.text)
+            .map((p) => p.text)
+            .join("\n")
+            .trim() || "";
 
-        const isRalphLoopTemplate = promptText.includes("You are starting a Ralph Loop") && 
+        const isRalphLoopTemplate =
+          promptText.includes("You are starting a Ralph Loop") &&
           promptText.includes("<user-task>");
-        const isCancelRalphTemplate = promptText.includes("Cancel the currently active Ralph Loop");
+        const isCancelRalphTemplate = promptText.includes(
+          "Cancel the currently active Ralph Loop"
+        );
 
         if (isRalphLoopTemplate) {
-          const taskMatch = promptText.match(/<user-task>\s*([\s\S]*?)\s*<\/user-task>/i);
+          const taskMatch = promptText.match(
+            /<user-task>\s*([\s\S]*?)\s*<\/user-task>/i
+          );
           const rawTask = taskMatch?.[1]?.trim() || "";
-          
+
           const quotedMatch = rawTask.match(/^["'](.+?)["']/);
-          const prompt = quotedMatch?.[1] || rawTask.split(/\s+--/)[0]?.trim() || "Complete the task as instructed";
+          const prompt =
+            quotedMatch?.[1] ||
+            rawTask.split(/\s+--/)[0]?.trim() ||
+            "Complete the task as instructed";
 
           const maxIterMatch = rawTask.match(/--max-iterations=(\d+)/i);
-          const promiseMatch = rawTask.match(/--completion-promise=["']?([^"'\s]+)["']?/i);
+          const promiseMatch = rawTask.match(
+            /--completion-promise=["']?([^"'\s]+)["']?/i
+          );
 
-          log("[ralph-loop] Starting loop from chat.message", { sessionID: input.sessionID, prompt });
+          log("[ralph-loop] Starting loop from chat.message", {
+            sessionID: input.sessionID,
+            prompt,
+          });
           ralphLoop.startLoop(input.sessionID, prompt, {
-            maxIterations: maxIterMatch ? parseInt(maxIterMatch[1], 10) : undefined,
+            maxIterations: maxIterMatch
+              ? parseInt(maxIterMatch[1], 10)
+              : undefined,
             completionPromise: promiseMatch?.[1],
           });
         } else if (isCancelRalphTemplate) {
-          log("[ralph-loop] Cancelling loop from chat.message", { sessionID: input.sessionID });
+          log("[ralph-loop] Cancelling loop from chat.message", {
+            sessionID: input.sessionID,
+          });
           ralphLoop.cancelLoop(input.sessionID);
         }
       }
@@ -283,209 +294,17 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
       input: Record<string, never>,
       output: { messages: Array<{ info: unknown; parts: unknown[] }> }
     ) => {
-      // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      await thinkingBlockValidator?.["experimental.chat.messages.transform"]?.(input, output as any);
-      // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      await emptyMessageSanitizer?.["experimental.chat.messages.transform"]?.(input, output as any);
+      await thinkingBlockValidator?.[
+        "experimental.chat.messages.transform"
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      ]?.(input, output as any);
+      await emptyMessageSanitizer?.[
+        "experimental.chat.messages.transform"
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      ]?.(input, output as any);
     },
 
-    config: async (config) => {
-      type ProviderConfig = {
-        options?: { headers?: Record<string, string> }
-        models?: Record<string, { limit?: { context?: number } }>
-      }
-      const providers = config.provider as Record<string, ProviderConfig> | undefined;
-
-      const anthropicBeta = providers?.anthropic?.options?.headers?.["anthropic-beta"];
-      anthropicContext1MEnabled = anthropicBeta?.includes("context-1m") ?? false;
-
-      if (providers) {
-        for (const [providerID, providerConfig] of Object.entries(providers)) {
-          const models = providerConfig?.models;
-          if (models) {
-            for (const [modelID, modelConfig] of Object.entries(models)) {
-              const contextLimit = modelConfig?.limit?.context;
-              if (contextLimit) {
-                modelContextLimitsCache.set(`${providerID}/${modelID}`, contextLimit);
-              }
-            }
-          }
-
-
-        }
-      }
-
-      const pluginComponents = (pluginConfig.claude_code?.plugins ?? true)
-        ? await loadAllPluginComponents({
-            enabledPluginsOverride: pluginConfig.claude_code?.plugins_override,
-          })
-        : { commands: {}, skills: {}, agents: {}, mcpServers: {}, hooksConfigs: [], plugins: [], errors: [] };
-
-      if (pluginComponents.plugins.length > 0) {
-        log(`Loaded ${pluginComponents.plugins.length} Claude Code plugins`, {
-          plugins: pluginComponents.plugins.map(p => `${p.name}@${p.version}`),
-        });
-      }
-
-      if (pluginComponents.errors.length > 0) {
-        log(`Plugin load errors`, { errors: pluginComponents.errors });
-      }
-
-      const builtinAgents = createBuiltinAgents(
-        pluginConfig.disabled_agents,
-        pluginConfig.agents,
-        ctx.directory,
-        config.model,
-      );
-
-      const userAgents = (pluginConfig.claude_code?.agents ?? true) ? loadUserAgents() : {};
-      const projectAgents = (pluginConfig.claude_code?.agents ?? true) ? loadProjectAgents() : {};
-      const pluginAgents = pluginComponents.agents;
-
-      const isSisyphusEnabled = pluginConfig.sisyphus_agent?.disabled !== true;
-      const builderEnabled = pluginConfig.sisyphus_agent?.default_builder_enabled ?? false;
-      const plannerEnabled = pluginConfig.sisyphus_agent?.planner_enabled ?? true;
-      const replacePlan = pluginConfig.sisyphus_agent?.replace_plan ?? true;
-
-      if (isSisyphusEnabled && builtinAgents.Sisyphus) {
-        // Set Sisyphus as default agent (feature added in OpenCode PR #5843)
-        (config as { default_agent?: string }).default_agent = "Sisyphus";
-
-        const agentConfig: Record<string, unknown> = {
-          Sisyphus: builtinAgents.Sisyphus,
-        };
-
-        if (builderEnabled) {
-          const { name: _buildName, ...buildConfigWithoutName } = config.agent?.build ?? {};
-          const openCodeBuilderOverride = pluginConfig.agents?.["OpenCode-Builder"];
-          const openCodeBuilderBase = {
-            ...buildConfigWithoutName,
-            description: `${config.agent?.build?.description ?? "Build agent"} (OpenCode default)`,
-          };
-
-          agentConfig["OpenCode-Builder"] = openCodeBuilderOverride
-            ? { ...openCodeBuilderBase, ...openCodeBuilderOverride }
-            : openCodeBuilderBase;
-        }
-
-        if (plannerEnabled) {
-          const { name: _planName, ...planConfigWithoutName } = config.agent?.plan ?? {};
-          const plannerSisyphusOverride = pluginConfig.agents?.["Planner-Sisyphus"];
-          const plannerSisyphusBase = {
-            ...planConfigWithoutName,
-            prompt: PLAN_SYSTEM_PROMPT,
-            permission: PLAN_PERMISSION,
-            description: `${config.agent?.plan?.description ?? "Plan agent"} (OhMyOpenCode version)`,
-            color: config.agent?.plan?.color ?? "#6495ED",
-          };
-
-          agentConfig["Planner-Sisyphus"] = plannerSisyphusOverride
-            ? { ...plannerSisyphusBase, ...plannerSisyphusOverride }
-            : plannerSisyphusBase;
-        }
-
-        // Filter out build/plan from config.agent - they'll be re-added as subagents if replaced
-        const filteredConfigAgents = config.agent ? 
-          Object.fromEntries(
-            Object.entries(config.agent).filter(([key]) => {
-              if (key === "build") return false;
-              if (key === "plan" && replacePlan) return false;
-              return true;
-            })
-          ) : {};
-
-        config.agent = {
-          ...agentConfig,
-          ...Object.fromEntries(Object.entries(builtinAgents).filter(([k]) => k !== "Sisyphus")),
-          ...userAgents,
-          ...projectAgents,
-          ...pluginAgents,
-          ...filteredConfigAgents,  // Filtered config agents (excludes build/plan if replaced)
-          // Demote build/plan to subagent mode when replaced
-          build: { ...config.agent?.build, mode: "subagent" },
-          ...(replacePlan ? { plan: { ...config.agent?.plan, mode: "subagent" } } : {}),
-        };
-      } else {
-        config.agent = {
-          ...builtinAgents,
-          ...userAgents,
-          ...projectAgents,
-          ...pluginAgents,
-          ...config.agent,
-        };
-      }
-
-      config.tools = {
-        ...config.tools,
-        "grep_app_*": false, // Disable grep_app tools globally to reduce token usage (only librarian needs them)
-      };
-
-      if (config.agent.explore) {
-        config.agent.explore.tools = {
-          ...config.agent.explore.tools,
-          call_omo_agent: false,
-        };
-      }
-      if (config.agent.librarian) {
-        config.agent.librarian.tools = {
-          ...config.agent.librarian.tools,
-          call_omo_agent: false,
-          "grep_app_*": true,
-        };
-      }
-      if (config.agent["multimodal-looker"]) {
-        config.agent["multimodal-looker"].tools = {
-          ...config.agent["multimodal-looker"].tools,
-          task: false,
-          call_omo_agent: false,
-          look_at: false,
-        };
-      }
-
-      config.permission = {
-        ...config.permission,
-        webfetch: "allow",
-        external_directory: "allow",
-      }
-
-      const mcpResult = (pluginConfig.claude_code?.mcp ?? true)
-        ? await loadMcpConfigs()
-        : { servers: {} };
-
-      config.mcp = {
-        ...config.mcp,
-        ...createBuiltinMcps(pluginConfig.disabled_mcps),
-        ...mcpResult.servers,
-        ...pluginComponents.mcpServers,
-      };
-
-      const builtinCommands = loadBuiltinCommands(pluginConfig.disabled_commands);
-      const userCommands = (pluginConfig.claude_code?.commands ?? true) ? loadUserCommands() : {};
-      const opencodeGlobalCommands = loadOpencodeGlobalCommands();
-      const systemCommands = config.command ?? {};
-      const projectCommands = (pluginConfig.claude_code?.commands ?? true) ? loadProjectCommands() : {};
-      const opencodeProjectCommands = loadOpencodeProjectCommands();
-
-      const userSkills = (pluginConfig.claude_code?.skills ?? true) ? loadUserSkills() : {};
-      const projectSkills = (pluginConfig.claude_code?.skills ?? true) ? loadProjectSkills() : {};
-      const opencodeGlobalSkills = loadOpencodeGlobalSkills();
-      const opencodeProjectSkills = loadOpencodeProjectSkills();
-
-      config.command = {
-        ...builtinCommands,
-        ...userCommands,
-        ...userSkills,
-        ...opencodeGlobalCommands,
-        ...opencodeGlobalSkills,
-        ...systemCommands,
-        ...projectCommands,
-        ...projectSkills,
-        ...opencodeProjectCommands,
-        ...opencodeProjectSkills,
-        ...pluginComponents.commands,
-        ...pluginComponents.skills,
-      };
-    },
+    config: configHandler,
 
     event: async (input) => {
       await autoUpdateChecker?.event(input);
@@ -564,7 +383,9 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
       if (input.tool === "task") {
         const args = output.args as Record<string, unknown>;
         const subagentType = args.subagent_type as string;
-        const isExploreOrLibrarian = ["explore", "librarian"].includes(subagentType);
+        const isExploreOrLibrarian = ["explore", "librarian"].includes(
+          subagentType
+        );
 
         args.tools = {
           ...(args.tools as Record<string, boolean> | undefined),
@@ -579,15 +400,23 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
         const sessionID = input.sessionID || getMainSessionID();
 
         if (command === "ralph-loop" && sessionID) {
-          const rawArgs = args?.command?.replace(/^\/?(ralph-loop)\s*/i, "") || "";
+          const rawArgs =
+            args?.command?.replace(/^\/?(ralph-loop)\s*/i, "") || "";
           const taskMatch = rawArgs.match(/^["'](.+?)["']/);
-          const prompt = taskMatch?.[1] || rawArgs.split(/\s+--/)[0]?.trim() || "Complete the task as instructed";
+          const prompt =
+            taskMatch?.[1] ||
+            rawArgs.split(/\s+--/)[0]?.trim() ||
+            "Complete the task as instructed";
 
           const maxIterMatch = rawArgs.match(/--max-iterations=(\d+)/i);
-          const promiseMatch = rawArgs.match(/--completion-promise=["']?([^"'\s]+)["']?/i);
+          const promiseMatch = rawArgs.match(
+            /--completion-promise=["']?([^"'\s]+)["']?/i
+          );
 
           ralphLoop.startLoop(sessionID, prompt, {
-            maxIterations: maxIterMatch ? parseInt(maxIterMatch[1], 10) : undefined,
+            maxIterations: maxIterMatch
+              ? parseInt(maxIterMatch[1], 10)
+              : undefined,
             completionPromise: promiseMatch?.[1],
           });
         } else if (command === "cancel-ralph" && sessionID) {

src/plugin-config.ts

@@ -0,0 +1,134 @@
+import * as fs from "fs";
+import * as path from "path";
+import { OhMyOpenCodeConfigSchema, type OhMyOpenCodeConfig } from "./config";
+import {
+  log,
+  deepMerge,
+  getUserConfigDir,
+  addConfigLoadError,
+  parseJsonc,
+  detectConfigFile,
+  migrateConfigFile,
+} from "./shared";
+
+export function loadConfigFromPath(
+  configPath: string,
+  ctx: unknown
+): OhMyOpenCodeConfig | null {
+  try {
+    if (fs.existsSync(configPath)) {
+      const content = fs.readFileSync(configPath, "utf-8");
+      const rawConfig = parseJsonc<Record<string, unknown>>(content);
+
+      migrateConfigFile(configPath, rawConfig);
+
+      const result = OhMyOpenCodeConfigSchema.safeParse(rawConfig);
+
+      if (!result.success) {
+        const errorMsg = result.error.issues
+          .map((i) => `${i.path.join(".")}: ${i.message}`)
+          .join(", ");
+        log(`Config validation error in ${configPath}:`, result.error.issues);
+        addConfigLoadError({
+          path: configPath,
+          error: `Validation error: ${errorMsg}`,
+        });
+        return null;
+      }
+
+      log(`Config loaded from ${configPath}`, { agents: result.data.agents });
+      return result.data;
+    }
+  } catch (err) {
+    const errorMsg = err instanceof Error ? err.message : String(err);
+    log(`Error loading config from ${configPath}:`, err);
+    addConfigLoadError({ path: configPath, error: errorMsg });
+  }
+  return null;
+}
+
+export function mergeConfigs(
+  base: OhMyOpenCodeConfig,
+  override: OhMyOpenCodeConfig
+): OhMyOpenCodeConfig {
+  return {
+    ...base,
+    ...override,
+    agents: deepMerge(base.agents, override.agents),
+    disabled_agents: [
+      ...new Set([
+        ...(base.disabled_agents ?? []),
+        ...(override.disabled_agents ?? []),
+      ]),
+    ],
+    disabled_mcps: [
+      ...new Set([
+        ...(base.disabled_mcps ?? []),
+        ...(override.disabled_mcps ?? []),
+      ]),
+    ],
+    disabled_hooks: [
+      ...new Set([
+        ...(base.disabled_hooks ?? []),
+        ...(override.disabled_hooks ?? []),
+      ]),
+    ],
+    disabled_commands: [
+      ...new Set([
+        ...(base.disabled_commands ?? []),
+        ...(override.disabled_commands ?? []),
+      ]),
+    ],
+    disabled_skills: [
+      ...new Set([
+        ...(base.disabled_skills ?? []),
+        ...(override.disabled_skills ?? []),
+      ]),
+    ],
+    claude_code: deepMerge(base.claude_code, override.claude_code),
+  };
+}
+
+export function loadPluginConfig(
+  directory: string,
+  ctx: unknown
+): OhMyOpenCodeConfig {
+  // User-level config path (OS-specific) - prefer .jsonc over .json
+  const userBasePath = path.join(
+    getUserConfigDir(),
+    "opencode",
+    "oh-my-opencode"
+  );
+  const userDetected = detectConfigFile(userBasePath);
+  const userConfigPath =
+    userDetected.format !== "none"
+      ? userDetected.path
+      : userBasePath + ".json";
+
+  // Project-level config path - prefer .jsonc over .json
+  const projectBasePath = path.join(directory, ".opencode", "oh-my-opencode");
+  const projectDetected = detectConfigFile(projectBasePath);
+  const projectConfigPath =
+    projectDetected.format !== "none"
+      ? projectDetected.path
+      : projectBasePath + ".json";
+
+  // Load user config first (base)
+  let config: OhMyOpenCodeConfig =
+    loadConfigFromPath(userConfigPath, ctx) ?? {};
+
+  // Override with project config
+  const projectConfig = loadConfigFromPath(projectConfigPath, ctx);
+  if (projectConfig) {
+    config = mergeConfigs(config, projectConfig);
+  }
+
+  log("Final merged config", {
+    agents: config.agents,
+    disabled_agents: config.disabled_agents,
+    disabled_mcps: config.disabled_mcps,
+    disabled_hooks: config.disabled_hooks,
+    claude_code: config.claude_code,
+  });
+  return config;
+}

src/plugin-handlers/config-handler.ts

@@ -0,0 +1,280 @@
+import { createBuiltinAgents } from "../agents";
+import {
+  loadUserCommands,
+  loadProjectCommands,
+  loadOpencodeGlobalCommands,
+  loadOpencodeProjectCommands,
+} from "../features/claude-code-command-loader";
+import { loadBuiltinCommands } from "../features/builtin-commands";
+import {
+  loadUserSkills,
+  loadProjectSkills,
+  loadOpencodeGlobalSkills,
+  loadOpencodeProjectSkills,
+} from "../features/opencode-skill-loader";
+import {
+  loadUserAgents,
+  loadProjectAgents,
+} from "../features/claude-code-agent-loader";
+import { loadMcpConfigs } from "../features/claude-code-mcp-loader";
+import { loadAllPluginComponents } from "../features/claude-code-plugin-loader";
+import { createBuiltinMcps } from "../mcp";
+import type { OhMyOpenCodeConfig } from "../config";
+import { log } from "../shared";
+import { PLAN_SYSTEM_PROMPT, PLAN_PERMISSION } from "../agents/plan-prompt";
+import type { ModelCacheState } from "../plugin-state";
+
+export interface ConfigHandlerDeps {
+  ctx: { directory: string };
+  pluginConfig: OhMyOpenCodeConfig;
+  modelCacheState: ModelCacheState;
+}
+
+export function createConfigHandler(deps: ConfigHandlerDeps) {
+  const { ctx, pluginConfig, modelCacheState } = deps;
+
+  return async (config: Record<string, unknown>) => {
+    type ProviderConfig = {
+      options?: { headers?: Record<string, string> };
+      models?: Record<string, { limit?: { context?: number } }>;
+    };
+    const providers = config.provider as
+      | Record<string, ProviderConfig>
+      | undefined;
+
+    const anthropicBeta =
+      providers?.anthropic?.options?.headers?.["anthropic-beta"];
+    modelCacheState.anthropicContext1MEnabled =
+      anthropicBeta?.includes("context-1m") ?? false;
+
+    if (providers) {
+      for (const [providerID, providerConfig] of Object.entries(providers)) {
+        const models = providerConfig?.models;
+        if (models) {
+          for (const [modelID, modelConfig] of Object.entries(models)) {
+            const contextLimit = modelConfig?.limit?.context;
+            if (contextLimit) {
+              modelCacheState.modelContextLimitsCache.set(
+                `${providerID}/${modelID}`,
+                contextLimit
+              );
+            }
+          }
+        }
+      }
+    }
+
+    const pluginComponents = (pluginConfig.claude_code?.plugins ?? true)
+      ? await loadAllPluginComponents({
+          enabledPluginsOverride: pluginConfig.claude_code?.plugins_override,
+        })
+      : {
+          commands: {},
+          skills: {},
+          agents: {},
+          mcpServers: {},
+          hooksConfigs: [],
+          plugins: [],
+          errors: [],
+        };
+
+    if (pluginComponents.plugins.length > 0) {
+      log(`Loaded ${pluginComponents.plugins.length} Claude Code plugins`, {
+        plugins: pluginComponents.plugins.map((p) => `${p.name}@${p.version}`),
+      });
+    }
+
+    if (pluginComponents.errors.length > 0) {
+      log(`Plugin load errors`, { errors: pluginComponents.errors });
+    }
+
+    const builtinAgents = createBuiltinAgents(
+      pluginConfig.disabled_agents,
+      pluginConfig.agents,
+      ctx.directory,
+      config.model as string | undefined
+    );
+
+    const userAgents = (pluginConfig.claude_code?.agents ?? true)
+      ? loadUserAgents()
+      : {};
+    const projectAgents = (pluginConfig.claude_code?.agents ?? true)
+      ? loadProjectAgents()
+      : {};
+    const pluginAgents = pluginComponents.agents;
+
+    const isSisyphusEnabled = pluginConfig.sisyphus_agent?.disabled !== true;
+    const builderEnabled =
+      pluginConfig.sisyphus_agent?.default_builder_enabled ?? false;
+    const plannerEnabled =
+      pluginConfig.sisyphus_agent?.planner_enabled ?? true;
+    const replacePlan = pluginConfig.sisyphus_agent?.replace_plan ?? true;
+
+    type AgentConfig = Record<
+      string,
+      Record<string, unknown> | undefined
+    > & {
+      build?: Record<string, unknown>;
+      plan?: Record<string, unknown>;
+      explore?: { tools?: Record<string, unknown> };
+      librarian?: { tools?: Record<string, unknown> };
+      "multimodal-looker"?: { tools?: Record<string, unknown> };
+    };
+    const configAgent = config.agent as AgentConfig | undefined;
+
+    if (isSisyphusEnabled && builtinAgents.Sisyphus) {
+      (config as { default_agent?: string }).default_agent = "Sisyphus";
+
+      const agentConfig: Record<string, unknown> = {
+        Sisyphus: builtinAgents.Sisyphus,
+      };
+
+      if (builderEnabled) {
+        const { name: _buildName, ...buildConfigWithoutName } =
+          configAgent?.build ?? {};
+        const openCodeBuilderOverride =
+          pluginConfig.agents?.["OpenCode-Builder"];
+        const openCodeBuilderBase = {
+          ...buildConfigWithoutName,
+          description: `${configAgent?.build?.description ?? "Build agent"} (OpenCode default)`,
+        };
+
+        agentConfig["OpenCode-Builder"] = openCodeBuilderOverride
+          ? { ...openCodeBuilderBase, ...openCodeBuilderOverride }
+          : openCodeBuilderBase;
+      }
+
+      if (plannerEnabled) {
+        const { name: _planName, ...planConfigWithoutName } =
+          configAgent?.plan ?? {};
+        const plannerSisyphusOverride =
+          pluginConfig.agents?.["Planner-Sisyphus"];
+        const plannerSisyphusBase = {
+          ...planConfigWithoutName,
+          prompt: PLAN_SYSTEM_PROMPT,
+          permission: PLAN_PERMISSION,
+          description: `${configAgent?.plan?.description ?? "Plan agent"} (OhMyOpenCode version)`,
+          color: (configAgent?.plan?.color as string) ?? "#6495ED",
+        };
+
+        agentConfig["Planner-Sisyphus"] = plannerSisyphusOverride
+          ? { ...plannerSisyphusBase, ...plannerSisyphusOverride }
+          : plannerSisyphusBase;
+      }
+
+      const filteredConfigAgents = configAgent
+        ? Object.fromEntries(
+            Object.entries(configAgent).filter(([key]) => {
+              if (key === "build") return false;
+              if (key === "plan" && replacePlan) return false;
+              return true;
+            })
+          )
+        : {};
+
+      config.agent = {
+        ...agentConfig,
+        ...Object.fromEntries(
+          Object.entries(builtinAgents).filter(([k]) => k !== "Sisyphus")
+        ),
+        ...userAgents,
+        ...projectAgents,
+        ...pluginAgents,
+        ...filteredConfigAgents,
+        build: { ...configAgent?.build, mode: "subagent" },
+        ...(replacePlan
+          ? { plan: { ...configAgent?.plan, mode: "subagent" } }
+          : {}),
+      };
+    } else {
+      config.agent = {
+        ...builtinAgents,
+        ...userAgents,
+        ...projectAgents,
+        ...pluginAgents,
+        ...configAgent,
+      };
+    }
+
+    const agentResult = config.agent as AgentConfig;
+
+    config.tools = {
+      ...(config.tools as Record<string, unknown>),
+      "grep_app_*": false,
+    };
+
+    if (agentResult.explore) {
+      agentResult.explore.tools = {
+        ...agentResult.explore.tools,
+        call_omo_agent: false,
+      };
+    }
+    if (agentResult.librarian) {
+      agentResult.librarian.tools = {
+        ...agentResult.librarian.tools,
+        call_omo_agent: false,
+        "grep_app_*": true,
+      };
+    }
+    if (agentResult["multimodal-looker"]) {
+      agentResult["multimodal-looker"].tools = {
+        ...agentResult["multimodal-looker"].tools,
+        task: false,
+        call_omo_agent: false,
+        look_at: false,
+      };
+    }
+
+    config.permission = {
+      ...(config.permission as Record<string, unknown>),
+      webfetch: "allow",
+      external_directory: "allow",
+    };
+
+    const mcpResult = (pluginConfig.claude_code?.mcp ?? true)
+      ? await loadMcpConfigs()
+      : { servers: {} };
+
+    config.mcp = {
+      ...(config.mcp as Record<string, unknown>),
+      ...createBuiltinMcps(pluginConfig.disabled_mcps),
+      ...mcpResult.servers,
+      ...pluginComponents.mcpServers,
+    };
+
+    const builtinCommands = loadBuiltinCommands(pluginConfig.disabled_commands);
+    const userCommands = (pluginConfig.claude_code?.commands ?? true)
+      ? loadUserCommands()
+      : {};
+    const opencodeGlobalCommands = loadOpencodeGlobalCommands();
+    const systemCommands = (config.command as Record<string, unknown>) ?? {};
+    const projectCommands = (pluginConfig.claude_code?.commands ?? true)
+      ? loadProjectCommands()
+      : {};
+    const opencodeProjectCommands = loadOpencodeProjectCommands();
+
+    const userSkills = (pluginConfig.claude_code?.skills ?? true)
+      ? loadUserSkills()
+      : {};
+    const projectSkills = (pluginConfig.claude_code?.skills ?? true)
+      ? loadProjectSkills()
+      : {};
+    const opencodeGlobalSkills = loadOpencodeGlobalSkills();
+    const opencodeProjectSkills = loadOpencodeProjectSkills();
+
+    config.command = {
+      ...builtinCommands,
+      ...userCommands,
+      ...userSkills,
+      ...opencodeGlobalCommands,
+      ...opencodeGlobalSkills,
+      ...systemCommands,
+      ...projectCommands,
+      ...projectSkills,
+      ...opencodeProjectCommands,
+      ...opencodeProjectSkills,
+      ...pluginComponents.commands,
+      ...pluginComponents.skills,
+    };
+  };
+}

src/plugin-handlers/index.ts

@@ -0,0 +1 @@
+export { createConfigHandler, type ConfigHandlerDeps } from "./config-handler";

src/plugin-state.ts

@@ -0,0 +1,30 @@
+export interface ModelCacheState {
+  modelContextLimitsCache: Map<string, number>;
+  anthropicContext1MEnabled: boolean;
+}
+
+export function createModelCacheState(): ModelCacheState {
+  return {
+    modelContextLimitsCache: new Map<string, number>(),
+    anthropicContext1MEnabled: false,
+  };
+}
+
+export function getModelLimit(
+  state: ModelCacheState,
+  providerID: string,
+  modelID: string
+): number | undefined {
+  const key = `${providerID}/${modelID}`;
+  const cached = state.modelContextLimitsCache.get(key);
+  if (cached) return cached;
+
+  if (
+    providerID === "anthropic" &&
+    state.anthropicContext1MEnabled &&
+    modelID.includes("sonnet")
+  ) {
+    return 1_000_000;
+  }
+  return undefined;
+}