@opentritium/dsh-codex-shim

中文说明

This plugin simulates Codex-style prompts, tool vocabulary, tool results, and WebUI presentation for selected model routes, helping GPT-family and other Codex-adapted models use tools more reliably.

This is a shim, not a Codex runtime. It does not start a Codex app-server, handle Codex OAuth, provide models or credentials, execute commands by itself, or provide a web-search backend. It consumes existing DSH capabilities only through public service definitions, consumers, and UI slots; when a model does not match or the bundle is removed, DSH continues with its normal tools and behavior.

Install in a profile

The examples below install the bundle into the WebUI web profile. dsh plugin owns the profile manifest and dependency list.

Download the Release tarball with gh

gh release download --repo OpenTritium/dsh-codex-shim --pattern 'opentritium-dsh-codex-shim-*.tgz'
pnpm dsh plugin --profile web add ./opentritium-dsh-codex-shim-*.tgz
pnpm dsh --profile web --dump-config

Without GitHub CLI, download the same latest-release asset with curl and jq:

curl -fsSL https://api.github.com/repos/OpenTritium/dsh-codex-shim/releases/latest \
  | jq -r '.assets[] | select(.name | endswith(".tgz")) | .browser_download_url' \
  | xargs -r curl -fLO
pnpm dsh plugin --profile web add ./opentritium-dsh-codex-shim-*.tgz
pnpm dsh --profile web --dump-config

*If the bundled `gpt-5.6-` rule is enough, skip the next two configuration sections.**

Configure through a configuration file

Configure this plugin through the profile's settings provider. The default file-backed provider uses $DSH_HOME/settings.yaml (normally ~/.dsh/settings.yaml); create or edit its codex-shim: section. The bundled gpt-5.6-* automatic rule remains in force until modelPatterns is explicitly set.

codex-shim:
  enabled: true
  modelPatterns:
    - gpt-5.6-*
    - deepseek-v4-*
  modelOverrides:
    - provider: openai
      model: gpt-5.6-luna
      enabled: true
    - provider: example-provider
      model: experimental-model
      enabled: false

enabled: false turns the shim off globally. modelPatterns replaces the automatic-rule list; use modelPatterns: [] to disable automatic matching. Each modelOverrides row is an exact provider/model decision and takes precedence over the patterns. Omit the row to let that model follow the automatic rules. Provider and model must exactly match the resolved DSH route.

The file-backed settings provider watches valid edits, so the route policy updates live. If a profile uses another settings provider, configure the same namespace through that provider instead.

Patch the WebUI for visual configuration (optional)

DSH 47f943859bef60e4160492346772ded9b24f765a does not yet let an external bundle expose a settings namespace to the WebUI. Install the tarball and use settings.yaml above if a settings card is unnecessary. For the better GUI experience, the matching release includes deepseek-harness-settings-client-exposure-47f9438.patch: a general WebUI settings allowlist extension with no OpenTritium or Codex behavior.

Apply the patch only to that exact clean DSH commit, rebuild DSH, then install the release tarball:

gh release download --repo OpenTritium/dsh-codex-shim --pattern 'opentritium-dsh-codex-shim-*.tgz' --pattern 'deepseek-harness-settings-client-exposure-47f9438.patch'
git clone https://github.com/deepseek-ai/deepseek-harness.git deepseek-harness
cd deepseek-harness
git checkout 47f943859bef60e4160492346772ded9b24f765a
git apply --check ../deepseek-harness-settings-client-exposure-47f9438.patch
git apply ../deepseek-harness-settings-client-exposure-47f9438.patch
pnpm install && pnpm run build
pnpm dsh plugin --profile web add ../opentritium-dsh-codex-shim-*.tgz
pnpm dsh --profile web --dump-config

The patch gives settings owners an explicit expose: 'client' option. It does not load this bundle, add an OpenTritium row, or alter model/tool behavior. Do not apply it to a dirty checkout or a different commit; wait for the upstream equivalent instead.

Uninstall

Removing the bundle needs no DSH patch and restores the plain upstream profile composition:

pnpm dsh plugin --profile web remove @opentritium/dsh-codex-shim
pnpm dsh --profile web --dump-config

If the optional WebUI patch was applied, remove the bundle first. Only reverse the patch when no other local external bundle uses expose: 'client':

pnpm dsh plugin --profile web remove @opentritium/dsh-codex-shim
git apply --reverse --check ../deepseek-harness-settings-client-exposure-47f9438.patch
git apply --reverse ../deepseek-harness-settings-client-exposure-47f9438.patch
pnpm run build
pnpm dsh --profile web --dump-config

dsh plugin remove removes the profile dependency and its bundle layer. To clear saved shim preferences as well, delete the complete codex-shim: section from $DSH_HOME/settings.yaml; the file-backed settings provider reloads valid edits.

Route and configuration

The bundle mounts the gate globally, but the Codex surface is applied only when all of these are true:

• the global switch is enabled;
• the resolved model matches an automatic pattern or an exact model override enables it;
• the current scope contains at least one shim tool.

The default automatic pattern is gpt-5.6-*. Users can replace it with patterns such as deepseek-v4-*, set it to an empty list to disable automatic matching, or use explicit provider/model overrides. The UI exposes the same settings through the DSH settings slot.

Shim tools

The following tools are registered by the bundle and advertised only on an active Codex route. “Degraded” means the underlying DSH capability cannot provide the complete Codex operation.

Masked tools

When a replacement tool is present, the gate hides overlapping host tools from the active prompt advertisement. It does not unregister them, so the host surface returns when the route changes or the shim is removed.

Masking is scope-aware. If a prerequisite tool is not resolvable in the current composition, its mask is not applied.

Limitations

• write_stdin is a polling adapter, not a full interactive terminal. A generic DSH shell definition and provider are required for stdin writes, signals, and terminal control.
• web_run is intentionally search-only. A future page-reference or web-fetch provider should add those capabilities through a separate DSH seam; this package does not ship an OpenAI-hosted provider.
• Patch interception covers direct Codex patch invocations. A patch hidden inside a larger shell script is left to the shell instead of being guessed.
• Tool availability follows profile composition. Missing shell, filesystem, or attachment capabilities produce explicit failures rather than simulated success.

The shim consumes capability definitions; it does not choose or implement providers. Provider selection remains the responsibility of the DSH profile.

TODO / Roadmap

These items are deferred work; they are not current capabilities:

• OpenAI Responses web fetch: add a separate DSH web definition/provider that uses the active Responses endpoint for the matched route, then expose page references, navigation, and fetch operations only when the provider supports them. Keep web_run search-only when it does not. Do not hardcode an endpoint or add an OpenAI-hosted search provider to this shim.
• Interactive terminal: extend the generic DSH shell definition and providers with stdin writes, signals, session listing/open/close, PTY behavior, and cross-platform parity; then upgrade write_stdin and session handling without claiming unsupported operations.
• Windows compatibility: add Windows CI coverage for bundle installation, profile composition, supported tool behavior, and WebUI startup before claiming Windows support.
• Codex parity: compare tool schemas, argument validation, errors, lifecycle behavior, permission prompts, transcript events, and WebUI presentation against the referenced Codex release. Add composition and acceptance tests for every supported capability before widening the surface.

The goal is the closest practical Codex experience over DSH capabilities. Runtime, OAuth, and Responses wire-protocol compatibility remain outside this package.

Compatibility

Each shim release is composition-tested against the listed baseline. Recheck tool schemas, prompt sections, approval/sandbox fields, and WebUI slot contracts after upgrading DSH or Codex.

Windows: behavior and compatibility on Windows are not yet tested. Development and testing target Unix-style shell and filesystem semantics; please report issues if you run into problems on Windows.

Development

pnpm install
pnpm run check
pnpm run bench

The published package includes lib/, cordis.patch.yml, both README files, and the license. Source persona and locale assets are bundled during tsdown build.

Pushing a vX.Y.Z tag that exactly matches package.json runs the GitHub Actions release workflow. It verifies the optional source integration, runs pnpm run check, attaches the packed tarball and optional GUI patch to a GitHub Release, and does not publish to npm.

License

MIT. See LICENSE.