ChatGPT Subscription for DSH

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Use your own ChatGPT subscription as a main-model provider in DeepSeek Harness (DSH). DSH keeps control of sessions, history and local tool execution. The plugin reuses DSH’s PiAiAdapter for message conversion and uses Sign in with ChatGPT (SIWC) OAuth for the Responses API. It does not start a second agent.

Version 0.1.8 is the first public distribution of qiubai-di/dsh-chatgpt-subscription. The release keeps the existing model, OAuth and request behavior; CLI release-version metadata is synchronized to 0.1.8. This is an independent integration, not an OpenAI-certified or officially endorsed product.

What it does

• Adds the ChatGPT subscription provider (openai-chatgpt) to DSH. Available models are the intersection of your account’s model directory and the pinned adapter’s supported catalog. No API key is required, and the route does not fall back to API-key billing.
• Supports streamed replies, local function/custom tools, durable tool-history replay and image input for models whose catalog declares image support. Images use DSH attachments and data URLs, not the Files upload API.
• Adds controlled native web_search to the same main-model Responses request. The model decides when to search. This route filters and blocks DSH’s local web_search; it does not replace the global search backend or start a separate search agent. Other providers are unaffected.
• Shows Using ChatGPT plan and a Manage usage link in the main conversation when this provider is selected. The notice does not display an account identity or remaining allowance.
• Enforces no-tool compaction, preserves trusted usage and typed context-overflow errors, and rejects conflicting or untrustworthy tool identities before local execution.

Other hosted capabilities, including image generation, Files/File Search, Code Interpreter and MCP, are not enabled. Model access, native search, server-side parameter acceptance and service availability depend on your account, workspace and upstream service. Offline tests do not guarantee those entitlements.

Requirements and compatibility

• Node.js 24 or newer.
• Dependencies are pinned to DSH 0.2.1-rc.2 and pi-ai 1.3.0. The local installer and launcher require exactly DSH 0.2.1-rc.2; they reject other host versions.
• DSH 0.2.1-rc.4 has only offline stream/persistence compatibility evidence. That is not installation, live-service or complete runtime support. Recheck compatibility before changing the host.
• The installer creates a POSIX shell launcher. Windows installation, command shims and permissions have not been verified.

Build and install from source

Direct GitHub installation has not been accepted for 0.1.8. No verified one-line GitHub install command is provided here. The repository is not a promise of npm-registry availability. The following commands refer to the source checkout, not an extracted runtime package.

From the 0.1.8 source directory:

npm ci --ignore-scripts --no-audit --no-fund
npm run check

check runs type checks, offline tests and the build. It does not sign in or call a real model. Host-backed image tests are skipped unless explicitly enabled; see offline verification and delivery limits. Dependency download may require network access.

Close DSH processes using this provider before installing or changing authorization. With the required DSH version available, install the dedicated profile and maintenance command:

npm run install:local

The installer builds and packs locked runtime dependencies, verifies archive copies with SHA-256 and creates a dedicated data directory and launcher. It does not replace the DSH executable, start DSH or sign in. Package installation uses --ignore-scripts. Existing destinations not managed by this plugin are refused.

Make sure the reported launcher directory is on your PATH, then create your own authorization:

dsh-chatgpt login

Complete the browser OAuth flow. The command receives a local loopback callback, saves your authorization and reads your account’s supported model directory without sending an inference request.

Use the existing DSH Web profile

The native web profile must already exist. From the source directory, while DSH is stopped:

npm run integrate:web

The integration script backs up the existing profile files, installs the archive produced by install:local and sets this plugin’s credentialHome. It preserves the existing default model and other providers, and shares the dedicated authorization store without copying tokens into the native profile. It does not sign in or send model requests.

Then start DSH and select a model under ChatGPT subscription in the conversation model picker:

dsh web

Alternatively, dsh-chatgpt run starts the dedicated chatgpt profile instead of integrating with the native Web profile.

Authorization commands

Command	Effect
dsh-chatgpt login	Sign in and refresh the supported account model directory.
dsh-chatgpt status	Read local authorization status and cached models without network access. Output can include your account identity; redact it before sharing.
dsh-chatgpt models	Refresh the account model directory without inference.
dsh-chatgpt logout	Revoke this application’s authorization and clear local tokens after successful revocation.
dsh-chatgpt run	Start DSH with the dedicated profile.
dsh-chatgpt help	Show command help.

The CLI accepts --home for a dedicated data directory. The source installer accepts --home, --bin-dir and --dsh; the Web integration script accepts --home, --dsh-home and --dsh. Consult their source before customizing locations. A failed model-directory refresh does not discard a saved grant. If revocation fails, tokens remain available for a retry. Stop the running provider before login, logout, reinstallation or reintegration.

Accounts, privacy and subscription limits

The OAuth implementation is generic. The distributed package contains no real account, subscription grant, access token or refresh token. Each user creates their own authorization data by signing in. The plugin does not import an existing Pi or Codex login cache.

Authorization is stored in the dedicated data directory through DSH’s local credentials service. It is a local credentials file, not OS-keychain-encrypted storage. Do not publish, share or commit the data directory, credentials, authorization URLs or unredacted status output. The native Web profile and maintenance CLI share that store and its refresh lock.

Requests consume your existing ChatGPT plan limits. Credits may also be consumed if you allow them in ChatGPT usage settings. This plugin does not provide a free or unlimited subscription and does not change your credits settings. An API cost estimate of zero is not a balance or an allowance check.

Prompts, selected history and supplied content are sent to OpenAI. store:false does not mean zero data retention or enterprise Zero Data Retention (ZDR). Do not treat the integration or its offline checks as official certification or a complete legal-compliance assessment.

Technical contracts and verification

• 0.1.8 offline verification, replay and cache limits
• Tool namespace contract
• Durable tool-identity replay contract
• Legal namespace fixture for BC interoperability
• Changelog

The 0.1.8 fix rejects contradictory evidence for a single tool item before releasing an executable block. Replay, stable request prefixes and offline persistence checks do not prove real model compliance, cache hits, subscription savings or a server context window. BC and OptChat are not bundled or modified.

License

MIT.