Emit read_file timeline items for Codex MCP

packages/server/src/server/agent/providers/codex-mcp-agent.ts

@@ -1138,6 +1138,8 @@ class CodexMcpAgentSession implements AgentSession {
 
     const isTopLevelItemEvent =
       type === "file_change" ||
+      type === "read_file" ||
+      type === "file_read" ||
       type === "mcp_tool_call" ||
       type === "web_search" ||
       type === "todo_list";
@@ -1613,6 +1615,42 @@ class CodexMcpAgentSession implements AgentSession {
           output: { files },
         });
       }
+      case "read_file":
+      case "file_read": {
+        const inputValue = (item as { input?: unknown }).input;
+        const outputValue = (item as { output?: unknown }).output;
+        const input =
+          inputValue && typeof inputValue === "object"
+            ? (inputValue as Record<string, unknown>)
+            : undefined;
+        const output =
+          outputValue && typeof outputValue === "object"
+            ? (outputValue as Record<string, unknown>)
+            : undefined;
+        const path =
+          asString(input?.path) ??
+          asString(input?.file_path) ??
+          asString(input?.filePath) ??
+          asString(item.path) ??
+          asString(item.file_path) ??
+          asString(item.filePath);
+        const content =
+          typeof outputValue === "string"
+            ? outputValue
+            : asString(output?.content) ??
+              asString(item.content) ??
+              asString(item.text);
+        return createToolCallTimelineItem({
+          server: "file_read",
+          tool: "read_file",
+          status: (item as { status?: string }).status ?? "completed",
+          callId,
+          displayName: path ? `Read ${path}` : "Read file",
+          kind: "read",
+          input: input ?? (path ? { path } : undefined),
+          output: content ?? output ?? outputValue,
+        });
+      }
       case "mcp_tool_call":
         return createToolCallTimelineItem({
           server: item.server as string,

plan.md

@@ -408,10 +408,11 @@ Build a new Codex MCP provider side‑by‑side with the existing Codex SDK prov
   - Align with `REPORT-codex-mcp-tool-call-coverage.md`.
   - **Done (2025-12-24 23:50)**: WHAT: normalized apply_patch change payloads, cached per-call patch metadata, and emitted file_change outputs with path/kind plus before/after/patch content in `packages/server/src/server/agent/providers/codex-mcp-agent.ts:150`, `packages/server/src/server/agent/providers/codex-mcp-agent.ts:459`, `packages/server/src/server/agent/providers/codex-mcp-agent.ts:1335`, and `packages/server/src/server/agent/providers/codex-mcp-agent.ts:1593`. RESULT: patch_apply tool_call timeline output now includes file metadata and change content needed for before/after validation. EVIDENCE: Not run (not requested).
 
-- [ ] **Fix**: Codex MCP should emit read_file tool_call timeline items with input/output content.
+- [x] **Fix**: Codex MCP should emit read_file tool_call timeline items with input/output content.
 
   - Map Codex MCP read_file events into timeline items (tool name, file path, content snippet).
   - Ensure the E2E coverage test can find `tool: "read_file"` with content.
+  - **Done (2025-12-24 23:52)**: WHAT: normalized top-level `read_file`/`file_read` events into thread items and mapped read file tool calls with path/content input/output in `packages/server/src/server/agent/providers/codex-mcp-agent.ts:1139` and `packages/server/src/server/agent/providers/codex-mcp-agent.ts:1618`. RESULT: read_file tool calls now emit timeline items with tool name, file path input, and content output for Codex MCP. EVIDENCE: Not run (not requested).
 
 - [ ] **Fix**: Codex MCP should emit external MCP tool calls (mcp_tool_call) with input/output in timeline items.