dsh-subscriptions

Use your own Claude and ChatGPT/Codex subscriptions as model providers in DeepSeek Harness — the same OAuth sign-in the Claude Code and Codex CLIs use. No API key.

Install

dsh plugin --profile web add github:DevViking-Persike/dsh-subscriptions

Restart dsh, then sign in to whichever subscription you have:

http://127.0.0.1:1458/claude/start
http://127.0.0.1:1458/codex/start

Each opens the vendor's own sign-in page and stores the resulting OAuth credential locally. Tokens refresh on their own; you sign in once.

Other endpoints: GET /<route>/status reports whether a subscription is connected and when its token expires; POST /<route>/logout removes the credential. The server binds to loopback only.

Configuration

Every field is optional.

- id: dsh-subscriptions
  name: 'dsh-subscriptions'
  config:
    routes: ['claude']
    controlPort: 1458

Model Experience

Transparent to the model: the plugin registers provider routes and streams responses, adding no tool, prompt section, or context.

What it affects is accounting, and the two routes deliberately disagree:

• Claude reports input_tokens already excluding cache reads, so nothing is subtracted.
• Codex includes them, so they are subtracted to keep the counts disjoint.

Both directions are pinned by tests recorded from the harness's own implementations, because getting either backwards raises nothing — it just misreports context in every cost display.

Text only on both routes. Image content is refused before a request is sent, since the serialization path would drop it and the model would answer a question it never saw.

Safety

• Credentials are written atomically with owner-only permissions (0600, parent 0700), and the file is read through a cross-process writer lock. Two DSH instances refreshing at once cannot corrupt the document or burn the refresh token twice — proven by a test that forks real processes, with a negative control that fails when the lock is removed.
• A token never appears in an error message, a log line, or the /status response. Upstream error bodies are redacted before being quoted.
• A failed refresh leaves the stored credential untouched, so a transient outage cannot force a re-login.
• A truncated stream raises STREAM_CLOSED rather than presenting as a finished response.
• A stale lock is never stolen: file age cannot prove its owner died, so orphan recovery stays an operator action.

Known Limitations and Deferred Work

• Version-sensitive by construction. This plugin lives outside the harness repository, which states it makes no compatibility promise before its first release. The chunk vocabulary is therefore verified at load, and a mismatch refuses to mount with a message naming the drifted field.
• The sign-in callback binds 127.0.0.1, while the vendors' registered redirect URIs say localhost. On a host where localhost resolves to ::1 first, the browser callback will not arrive. The ports are fixed by the public clients and cannot be reconfigured.
• Model catalogs are static configuration, not discovered from the vendor. A model your subscription serves but the catalog omits still works when named explicitly, resolving with the default context window.
• No image input, and the Codex route rejects stop sequences — the Responses API has no equivalent, and silently dropping one would let a model run past a boundary the caller relied on.
• The test suite runs entirely against local node:http servers. It proves this plugin's behavior, not that either vendor still speaks exactly this dialect: the fixtures encode the harness's belief about the wire, recorded from its own implementations.

Tests

npm install && node --test test/*.test.js

132 tests, no network and no credential required.

License

MIT — see LICENSE and NOTICE.md. Using this plugin means using your own subscription under its own terms.