Documentation
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Overview ¶
Package codex is the brainjar Platform adapter for OpenAI Codex CLI. Imported for side effects from internal/cli to register itself in the parent platform registry.
Runtime verified against openai/codex main @ 0127cef / rust-v0.122.0 (Apr 2026). Sync targets AGENTS.md at the project root; hooks use Codex's Claude-Code-compatible JSON schema in .codex/hooks.json and require [features] codex_hooks = true in the matching config.toml; MCP registration merges into ~/.codex/config.toml as a [mcp_servers.brainjar] table.
Index ¶
- type Platform
- func (c *Platform) Capabilities() platform.Capabilities
- func (c *Platform) Catalog() platform.ModelCatalog
- func (c *Platform) EmitSkills(_ context.Context, _ string, _ []platform.SkillEmit) (platform.SkillEmitResult, error)
- func (c *Platform) HooksStatus(_ context.Context, scope platform.HookScope, projectRoot string) (platform.HookStatus, error)
- func (c *Platform) InstallHooks(_ context.Context, scope platform.HookScope, projectRoot string) error
- func (c *Platform) InstallMCP(_ context.Context, scope platform.HookScope, projectRoot, home string) error
- func (c *Platform) MCPStatus(_ context.Context, scope platform.HookScope, projectRoot, home string) (platform.MCPStatus, error)
- func (c *Platform) MapModelPrefs(prefs *models.ModelPrefs) map[string]any
- func (c *Platform) ModelArgs(prefs *models.ModelPrefs) []string
- func (c *Platform) Name() string
- func (c *Platform) RemoveHooks(_ context.Context, scope platform.HookScope, projectRoot string) error
- func (c *Platform) RemoveMCP(_ context.Context, scope platform.HookScope, projectRoot string) error
- func (c *Platform) SkillsStatus(_ context.Context, _ string) (platform.SkillsStatus, error)
- func (c *Platform) Spawn(ctx context.Context, prompt string, extraArgs []string) (*exec.Cmd, error)
- func (c *Platform) Sync(_ context.Context, prompt string, projectRoot string) error
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type Platform ¶
type Platform struct{}
Platform adapts brainjar to the OpenAI Codex CLI.
func (*Platform) Capabilities ¶
func (c *Platform) Capabilities() platform.Capabilities
Capabilities implements Platform. Codex supports sync, hooks (behind a feature flag), MCP registration, and CLI-arg prompt injection. Local scope is Claude-specific — Codex has no gitignored-override file tier.
func (*Platform) Catalog ¶ added in v0.6.0
func (c *Platform) Catalog() platform.ModelCatalog
Catalog satisfies platform.Platform.
func (*Platform) EmitSkills ¶ added in v0.6.0
func (c *Platform) EmitSkills(_ context.Context, _ string, _ []platform.SkillEmit) (platform.SkillEmitResult, error)
EmitSkills returns ErrUnsupportedByPlatform — Codex has no skills loader yet. The CLI catches the sentinel and downgrades it to a one-line warning so sync still writes AGENTS.md.
func (*Platform) HooksStatus ¶
func (c *Platform) HooksStatus(_ context.Context, scope platform.HookScope, projectRoot string) (platform.HookStatus, error)
HooksStatus reports whether brainjar's hook is present and whether the installed command matches what InstallHooks would write now. Up to date means both entry and flag agree with a fresh install.
func (*Platform) InstallHooks ¶
func (c *Platform) InstallHooks(_ context.Context, scope platform.HookScope, projectRoot string) error
InstallHooks registers brainjar's UserPromptSubmit hook in <scope>/.codex/hooks.json and sets [features] codex_hooks = true in the matching config.toml. Both files are atomic-rewritten; sibling hooks and config keys are preserved.
func (*Platform) InstallMCP ¶
func (c *Platform) InstallMCP(_ context.Context, scope platform.HookScope, projectRoot, home string) error
InstallMCP registers brainjar as a stdio MCP server in $CODEX_HOME/config.toml under [mcp_servers.brainjar]. User scope only — Codex's own `codex mcp add` also writes user-global config, and project-scope MCP under an untrusted .codex is awkward.
func (*Platform) MCPStatus ¶
func (c *Platform) MCPStatus(_ context.Context, scope platform.HookScope, projectRoot, home string) (platform.MCPStatus, error)
MCPStatus reports registration presence and whether stored command + args match what InstallMCP would write now for the given home.
func (*Platform) MapModelPrefs ¶
func (c *Platform) MapModelPrefs(prefs *models.ModelPrefs) map[string]any
MapModelPrefs delegates to the catalog-backed canonical helper. Codex accepts arbitrary model identifiers server-side; unknown names pass through verbatim — a user who writes a specific ID meant exactly that.
func (*Platform) ModelArgs ¶ added in v0.6.0
func (c *Platform) ModelArgs(prefs *models.ModelPrefs) []string
ModelArgs renders prefs as argv for `codex` — `--model <id>`. The caller prepends the result so user-supplied `-- --model X` still wins.
func (*Platform) RemoveHooks ¶
func (c *Platform) RemoveHooks(_ context.Context, scope platform.HookScope, projectRoot string) error
RemoveHooks strips brainjar's hook entry from hooks.json. The codex_hooks feature flag is left alone — turning it off could disable other user-authored hooks, so that's a deliberate no-touch.
func (*Platform) RemoveMCP ¶
RemoveMCP strips brainjar's [mcp_servers.brainjar] table while preserving every sibling server entry.
func (*Platform) SkillsStatus ¶ added in v0.6.0
SkillsStatus returns ErrUnsupportedByPlatform for the same reason EmitSkills does — there is no on-disk skill surface for Codex.
func (*Platform) Spawn ¶
Spawn implements Platform. Builds an *exec.Cmd that runs `codex --system-prompt <prompt> [extraArgs...]`. Stdio is left nil so the caller wires the streams; PATH lookup happens at Start() time.
func (*Platform) Sync ¶
Sync writes the composed prompt into the managed section of <projectRoot>/AGENTS.md. Content outside the markers survives byte-for-byte. Idempotent: a second Sync with the same prompt is a no-op. Emits a warning to stderr when the final file would exceed Codex's 32 KiB AGENTS.md budget.
Source Files