diff --git a/.codex/agents/architecture_watcher.toml b/.codex/agents/architecture_watcher.toml
index 6bb92102..e55573df 100644
--- a/.codex/agents/architecture_watcher.toml
+++ b/.codex/agents/architecture_watcher.toml
@@ -1,7 +1,7 @@
 name = "architecture_watcher"
 description = "Read-only DevLog architecture boundary reviewer for module ownership, dependencies, DI, SDK placement, Widget flow, and StorePattern changes."
 model = "gpt-5.3-codex-spark"
-model_reasoning_effort = "medium"
+model_reasoning_effort = "xhigh"
 sandbox_mode = "read-only"
 developer_instructions = """
 Read AGENTS.md and .agents/roles.md before reviewing.
diff --git a/.codex/agents/code_reviewer.toml b/.codex/agents/code_reviewer.toml
index bfcf6c39..bdf69106 100644
--- a/.codex/agents/code_reviewer.toml
+++ b/.codex/agents/code_reviewer.toml
@@ -1,7 +1,7 @@
 name = "code_reviewer"
 description = "Read-only DevLog code reviewer focused on correctness, regressions, scope drift, and missing verification."
 model = "gpt-5.3-codex-spark"
-model_reasoning_effort = "medium"
+model_reasoning_effort = "xhigh"
 sandbox_mode = "read-only"
 developer_instructions = """
 Read AGENTS.md and .agents/roles.md before reviewing.
diff --git a/.codex/agents/documentation_writer.toml b/.codex/agents/documentation_writer.toml
index 3fea7a9f..e555c258 100644
--- a/.codex/agents/documentation_writer.toml
+++ b/.codex/agents/documentation_writer.toml
@@ -1,7 +1,7 @@
 name = "documentation_writer"
 description = "DevLog documentation writer for PR bodies, issue text, review replies, release notes, and repository documentation changes."
 model = "gpt-5.3-codex-spark"
-model_reasoning_effort = "medium"
+model_reasoning_effort = "xhigh"
 sandbox_mode = "workspace-write"
 developer_instructions = """
 Read AGENTS.md and .agents/roles.md before drafting.
diff --git a/.codex/agents/github_ci_analyst.toml b/.codex/agents/github_ci_analyst.toml
index b0c8be63..9239c0e3 100644
--- a/.codex/agents/github_ci_analyst.toml
+++ b/.codex/agents/github_ci_analyst.toml
@@ -1,7 +1,7 @@
 name = "github_ci_analyst"
 description = "Read-only DevLog GitHub and CI analyst for live issues, PR metadata, review threads, and Actions logs."
 model = "gpt-5.3-codex-spark"
-model_reasoning_effort = "medium"
+model_reasoning_effort = "xhigh"
 sandbox_mode = "read-only"
 developer_instructions = """
 Read AGENTS.md and .agents/roles.md before analysis.
diff --git a/.codex/agents/verification_runner.toml b/.codex/agents/verification_runner.toml
index ef944ad4..ac525f27 100644
--- a/.codex/agents/verification_runner.toml
+++ b/.codex/agents/verification_runner.toml
@@ -1,7 +1,7 @@
 name = "verification_runner"
 description = "DevLog verification runner for changed-file lint, build-only checks, tests that do not launch the app, and diff validation."
 model = "gpt-5.3-codex-spark"
-model_reasoning_effort = "medium"
+model_reasoning_effort = "xhigh"
 sandbox_mode = "workspace-write"
 developer_instructions = """
 Read AGENTS.md and .agents/roles.md before verification.