The codex_local adapter runs OpenAI’s Codex CLI locally. It supports session persistence via previous_response_id chaining and skills injection through the global Codex skills directory.

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Prerequisites

  • Codex CLI installed (codex command available)
  • OPENAI_API_KEY set in the environment or agent config

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Configuration Fields

FieldTypeRequiredDescription
cwdstringYesWorking directory for the agent process (absolute path; created automatically if missing when permissions allow)
modelstringNoModel to use
promptTemplatestringNoPrompt used for all runs
envobjectNoEnvironment variables (supports secret refs)
timeoutSecnumberNoProcess timeout (0 = no timeout)
graceSecnumberNoGrace period before force-kill
dangerouslyBypassApprovalsAndSandboxbooleanNoSkip safety checks (dev only)

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Session Persistence

Codex uses previous_response_id for session continuity. The adapter serializes and restores this across heartbeats, allowing the agent to maintain conversation context.

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Skills Injection

The adapter symlinks FideliOS skills into the global Codex skills directory (~/.codex/skills). Existing user skills are not overwritten. When FideliOS is running inside a managed worktree instance (FIDELIOS_IN_WORKTREE=true), the adapter instead uses a worktree-isolated CODEX_HOME under the FideliOS instance so Codex skills, sessions, logs, and other runtime state do not leak across checkouts. It seeds that isolated home from the user’s main Codex home for shared auth/config continuity. For manual local CLI usage outside heartbeat runs (for example running as codexcoder directly), use: 
pnpm fidelios agent local-cli codexcoder --company-id <company-id>
This installs any missing skills, creates an agent API key, and prints shell exports to run as that agent.

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Instructions Resolution

If instructionsFilePath is configured, FideliOS reads that file and prepends it to the stdin prompt sent to codex exec on every run. This is separate from any workspace-level instruction discovery that Codex itself performs in the run cwd. FideliOS does not disable Codex-native repo instruction files, so a repo-local AGENTS.md may still be loaded by Codex in addition to the FideliOS-managed agent instructions.

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Environment Test

The environment test checks:
  • Codex CLI is installed and accessible
  • Working directory is absolute and available (auto-created if missing and permitted)
  • Authentication signal (OPENAI_API_KEY presence)
  • A live hello probe (codex exec --json - with prompt Respond with hello.) to verify the CLI can actually run