Tool use failures (git/head) in Codex with Daybreak Blue

What version of Codex CLI is running?

0.151.0

What subscription do you have?

Pro

Which model were you using?

gpt-daybreak-blue-latest (medium)

What platform is your computer?

macOS

What terminal emulator and version are you using (if applicable)?

iTerm2

Codex doctor report

patj@studio ~ % codex doctor --json
{
  "schemaVersion": 1,
  "generatedAt": "1788119691s since unix epoch",
  "overallStatus": "ok",
  "codexVersion": "0.151.0",
  "checks": {
    "app_server.status": {
      "id": "app_server.status",
      "category": "app-server",
      "status": "ok",
      "summary": "background server is not running",
      "details": {
        "control socket": "/Users/patj/.codex/app-server-control/app-server-control.sock",
        "daemon state dir": "/Users/patj/.codex/app-server-daemon",
        "mode": "ephemeral",
        "pid file": "/Users/patj/.codex/app-server-daemon/app-server.pid (missing)",
        "settings": "/Users/patj/.codex/app-server-daemon/settings.json (missing)",
        "status": "not running",
        "update-loop pid file": "/Users/patj/.codex/app-server-daemon/app-server-updater.pid (missing)"
      },
      "remediation": null,
      "durationMs": 0
    },
    "auth.credentials": {
      "id": "auth.credentials",
      "category": "auth",
      "status": "ok",
      "summary": "auth is configured",
      "details": {
        "auth file": "/Users/patj/.codex/auth.json",
        "auth storage mode": "File",
        "stored API key": "false",
        "stored ChatGPT tokens": "true",
        "stored agent identity": "false",
        "stored auth mode": "chatgpt"
      },
      "remediation": null,
      "durationMs": 0
    },
    "config.load": {
      "id": "config.load",
      "category": "config",
      "status": "ok",
      "summary": "config loaded",
      "details": {
        "CODEX_HOME": "/Users/patj/.codex",
        "config.toml": "/Users/patj/.codex/config.toml",
        "config.toml parse": "ok",
        "cwd": "/Users/patj",
        "enabled feature flags": "shell_tool, view_image, unified_exec, unified_exec_zsh_fork, shell_snapshot, content_item_kinds, code_mode_host, terminal_resize_reflow, sqlite, memories, hooks, enable_request_compression, unbounded_connection_retries, multi_agent, apps, tool_search_always_defer_mcp_tools, tool_suggest, plugins, in_app_browser, in_app_chat, in_app_dictation, in_app_local_automation, in_app_updates, browser_use, browser_use_full_cdp_access, browser_use_external, computer_use, remote_plugin, plugin_sharing, image_generation, resize_all_images, item_ids, skill_mcp_dependency_install, skill_search, mentions_v2, steer, guardian_approval, goals, collaboration_modes, tool_call_mcp_elicitation, auth_elicitation, personality, fast_mode, tui_app_server, remote_compaction_v2, compaction_image_budget, workspace_dependencies",
        "feature flag overrides": "memories=true",
        "feature flags enabled": "47",
        "log dir": "/Users/patj/.codex/log",
        "mcp servers": "2",
        "model": "gpt-daybreak-blue-latest",
        "model provider": "openai",
        "sqlite home": "/Users/patj/.codex"
      },
      "remediation": null,
      "durationMs": 0
    },
    "desktop.app.version": {
      "id": "desktop.app.version",
      "category": "desktop",
      "status": "ok",
      "summary": "the desktop application is installed",
      "details": {
        "log directory": "$HOME/Library/Logs/com.openai.codex",
        "running": "false",
        "version": "26.818.41509"
      },
      "remediation": null,
      "durationMs": 0
    },
    "desktop.app_server.handshake": {
      "id": "desktop.app_server.handshake",
      "category": "desktop",
      "status": "ok",
      "summary": "the desktop application is not running",
      "details": {},
      "remediation": null,
      "durationMs": 0
    },
    "desktop.security.enforcement": {
      "id": "desktop.security.enforcement",
      "category": "desktop",
      "status": "ok",
      "summary": "the desktop application passed available macos security assessments",
      "details": {
        "gatekeeper": "accepted"
      },
      "remediation": null,
      "durationMs": 0
    },
    "git.environment": {
      "id": "git.environment",
      "category": "git",
      "status": "ok",
      "summary": "git version 2.50.1 (Apple Git-155)",
      "details": {
        "PATH git #1": "/usr/bin/git",
        "PATH git entries": "1",
        "git build options": "git version 2.50.1 (Apple Git-155); cpu: arm64; no commit associated with this build; sizeof-long: 8; sizeof-size_t: 8; shell-path: /bin/sh; feature: fsmonitor--daemon; libcurl: 8.7.1; zlib: 1.2.12; SHA-1: SHA1_DC; SHA-256: SHA256_BLK",
        "git exec path": "/Library/Developer/CommandLineTools/usr/libexec/git-core",
        "git version": "git version 2.50.1 (Apple Git-155)",
        "repo detected": "false",
        "selected git": "/usr/bin/git"
      },
      "remediation": null,
      "durationMs": 146
    },
    "installation": {
      "id": "installation",
      "category": "install",
      "status": "ok",
      "summary": "installation looks consistent",
      "details": {
        "PATH codex #1": "/opt/homebrew/bin/codex",
        "current executable": "/opt/homebrew/bin/codex",
        "install context": "brew (package /opt/homebrew/Caskroom/codex/0.151.0, bin /opt/homebrew/Caskroom/codex/0.151.0/bin, resources /opt/homebrew/Caskroom/codex/0.151.0/codex-resources, path /opt/homebrew/Caskroom/codex/0.151.0/codex-path)",
        "managed by bun": "false",
        "managed by npm": "false",
        "managed by pnpm": "false",
        "managed package root": "not set"
      },
      "remediation": null,
      "durationMs": 1
    },
    "mcp.config": {
      "id": "mcp.config",
      "category": "mcp",
      "status": "ok",
      "summary": "MCP configuration is locally consistent",
      "details": {
        "configured servers": "2",
        "disabled servers": "1",
        "stdio servers": "2"
      },
      "remediation": null,
      "durationMs": 0
    },
    "network.env": {
      "id": "network.env",
      "category": "network",
      "status": "ok",
      "summary": "network-related environment looks readable",
      "details": {
        "managed proxy": "not configured",
        "proxy env vars": "none",
        "respect system proxy": "disabled",
        "system proxy": "direct"
      },
      "remediation": null,
      "durationMs": 0
    },
    "network.provider_reachability": {
      "id": "network.provider_reachability",
      "category": "reachability",
      "status": "ok",
      "summary": "active provider endpoints are reachable over HTTP",
      "details": {
        "ChatGPT inference URL": "https://chatgpt.com/backend-api/<redacted> reachable (HTTP 405)",
        "desktop assets CDN": "https://chatgpt.com/backend-api/<redacted> reachable (HTTP 200)",
        "reachability mode": "ChatGPT auth"
      },
      "remediation": null,
      "durationMs": 313
    },
    "network.websocket_reachability": {
      "id": "network.websocket_reachability",
      "category": "websocket",
      "status": "ok",
      "summary": "Responses WebSocket handshake succeeded",
      "details": {
        "DNS": "2 IPv4, 2 IPv6, first IPv6",
        "auth mode": "chatgpt",
        "connect timeout": "15000 ms",
        "endpoint": "wss://chatgpt.com/backend-api/<redacted>",
        "handshake result": "HTTP 101 Switching Protocols",
        "model provider": "openai",
        "provider name": "OpenAI",
        "proxy env vars": "none",
        "reasoning header": "false",
        "server model present": "false",
        "supports websockets": "true",
        "wire API": "responses"
      },
      "remediation": null,
      "durationMs": 697
    },
    "runtime.provenance": {
      "id": "runtime.provenance",
      "category": "runtime",
      "status": "ok",
      "summary": "running brew on macos-aarch64",
      "details": {
        "commit": "unknown",
        "current executable": "/opt/homebrew/bin/codex",
        "install method": "brew (package /opt/homebrew/Caskroom/codex/0.151.0, bin /opt/homebrew/Caskroom/codex/0.151.0/bin, resources /opt/homebrew/Caskroom/codex/0.151.0/codex-resources, path /opt/homebrew/Caskroom/codex/0.151.0/codex-path)",
        "platform": "macos-aarch64",
        "version": "0.151.0"
      },
      "remediation": null,
      "durationMs": 0
    },
    "runtime.search": {
      "id": "runtime.search",
      "category": "search",
      "status": "ok",
      "summary": "search is OK (bundled)",
      "details": {
        "search command": "/opt/homebrew/Caskroom/codex/0.151.0/codex-path/rg",
        "search command readiness": "file exists",
        "search provider": "bundled"
      },
      "remediation": null,
      "durationMs": 0
    },
    "sandbox.helpers": {
      "id": "sandbox.helpers",
      "category": "sandbox",
      "status": "ok",
      "summary": "sandbox configuration is readable",
      "details": {
        "approval policy": "OnRequest",
        "codex-linux-sandbox helper": "none",
        "execve wrapper helper": "/Users/patj/.codex/tmp/arg0/codex-arg0gHe8Kj/codex-execve-wrapper",
        "filesystem sandbox": "restricted",
        "network sandbox": "enabled"
      },
      "remediation": null,
      "durationMs": 0
    },
    "security.endpoint": {
      "id": "security.endpoint",
      "category": "security",
      "status": "ok",
      "summary": "no supported endpoint protection detected",
      "details": {
        "endpoint products": "none detected"
      },
      "remediation": null,
      "durationMs": 5
    },
    "state.paths": {
      "id": "state.paths",
      "category": "state",
      "status": "ok",
      "summary": "state paths and databases are inspectable",
      "details": {
        "CODEX_HOME": "/Users/patj/.codex (dir)",
        "active rollout files": "365 files, 680293980 total bytes, 1863819 average bytes",
        "archived rollout files": "165 files, 443786222 total bytes, 2689613 average bytes",
        "goals DB": "/Users/patj/.codex/goals_1.sqlite (file)",
        "goals DB integrity": "ok",
        "log DB": "/Users/patj/.codex/logs_2.sqlite (file)",
        "log DB integrity": "ok",
        "log dir": "/Users/patj/.codex/log (missing)",
        "memories DB": "/Users/patj/.codex/memories_1.sqlite (file)",
        "memories DB integrity": "ok",
        "queue DB": "/Users/patj/.codex/queue_1.sqlite (file)",
        "queue DB integrity": "ok",
        "sqlite home": "/Users/patj/.codex (dir)",
        "state DB": "/Users/patj/.codex/state_5.sqlite (file)",
        "state DB integrity": "ok",
        "thread history DB": "/Users/patj/.codex/thread_history_1.sqlite (file)",
        "thread history DB integrity": "ok"
      },
      "remediation": null,
      "durationMs": 520
    },
    "state.rollout_db_parity": {
      "id": "state.rollout_db_parity",
      "category": "threads",
      "status": "ok",
      "summary": "rollout files and state DB thread inventory agree",
      "details": {
        "default model provider": "openai",
        "rollout DB active files": "365",
        "rollout DB active rows": "365",
        "rollout DB archive mismatches": "0",
        "rollout DB archived files": "165",
        "rollout DB archived rows": "165",
        "rollout DB duplicate DB paths": "0",
        "rollout DB duplicate rollout thread ids": "0",
        "rollout DB malformed file names": "0",
        "rollout DB missing active rows": "0",
        "rollout DB missing archived rows": "0",
        "rollout DB model providers": "openai=530",
        "rollout DB rows": "530",
        "rollout DB scan cap reached": "false",
        "rollout DB scan errors": "0",
        "rollout DB sources": "subagent:other=273, vscode=180, cli=77",
        "rollout DB stale rows": "0"
      },
      "remediation": null,
      "durationMs": 279
    },
    "system.disk": {
      "id": "system.disk",
      "category": "disk",
      "status": "ok",
      "summary": "sufficient free disk space (140.0 GiB)",
      "details": {
        "CODEX_HOME available": "140.0 GiB",
        "failure threshold": "1.0 GiB",
        "warning threshold": "5.0 GiB",
        "worktree available": "140.0 GiB"
      },
      "remediation": null,
      "durationMs": 0
    },
    "system.environment": {
      "id": "system.environment",
      "category": "system",
      "status": "ok",
      "summary": "OS language en-US",
      "details": {
        "EDITOR": "not set",
        "LANG": "en_US.UTF-8",
        "VISUAL": "not set",
        "os": "Mac OS 26.6.2 [64-bit]",
        "os language": "en-US",
        "os type": "Mac OS",
        "os version": "26.6.2"
      },
      "remediation": null,
      "durationMs": 2
    },
    "terminal.env": {
      "id": "terminal.env",
      "category": "terminal",
      "status": "ok",
      "summary": "terminal metadata was detected",
      "details": {
        "SSH_CLIENT": "present",
        "SSH_CONNECTION": "present",
        "SSH_TTY": "present",
        "TERM": "xterm-256color",
        "color output": "enabled",
        "effective locale": "en_US.UTF-8",
        "stderr is terminal": "true",
        "stdin is terminal": "true",
        "stdout is terminal": "true",
        "terminal": "unknown",
        "terminal size": "189x56"
      },
      "remediation": null,
      "durationMs": 0
    },
    "terminal.title": {
      "id": "terminal.title",
      "category": "title",
      "status": "ok",
      "summary": "terminal title default",
      "details": {
        "terminal title activity": "true",
        "terminal title items": "activity, project-name",
        "terminal title project source": "cwd",
        "terminal title project value": "patj",
        "terminal title source": "default"
      },
      "remediation": null,
      "durationMs": 0
    },
    "updates.status": {
      "id": "updates.status",
      "category": "updates",
      "status": "ok",
      "summary": "update configuration is locally consistent",
      "details": {
        "cached latest version": "0.151.0",
        "check for update on startup": "true",
        "last checked at": "2026-08-29T18:33:07.412855Z",
        "latest version": "0.151.0",
        "latest version status": "current version is not older",
        "update action": "brew upgrade --cask codex",
        "version cache": "/Users/patj/.codex/version.json"
      },
      "remediation": null,
      "durationMs": 84
    }
  }
}

What issue are you seeing?

Thread ID: 01a0542e-fd64-7a21-9dd0-64222711f7cc (report filed Sun Aug 30 12:50PM PST)

While using Daybreak Blue doing research on existing Github PRs to build a new certification test, I am experiencing sporradic tool use errors where local tools canot be found.

What steps can reproduce the bug?

Uploaded thread

What is the expected behavior?

No response

Additional information

No response

Start by reproducing the reported git/head tool failure with Codex CLI 0.151.0 on macOS, using the environment details and codex doctor report in the issue. No source file, test, expected behavior, or completion criterion is named, so identify the relevant CLI tool entry point and define a regression test before implementation.