## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work
> - Claude agents that run in a remote sandbox need a safe in-product
login path
> - The existing host login route cannot open a pseudo-terminal inside
that sandbox
> - The login flow must protect the browser code, the login URL, and the
OAuth token at every step
> - This pull request adds the parser, the runner, a Daytona
pseudo-terminal transport, and a guarded, owner-bound session route
behind an injectable transport
> - The route stays inert in the default build and fails closed until a
sandbox provider binds the live transport
> - The benefit is a company-scoped setup-token flow with one-time
secret delivery, redaction, and fail-closed transport checks, ready for
a later staged production rollout
## Linked Issues or Issue Description
**Agent or provider**
Claude Code setup-token login for sandbox agents.
**Why this adapter is useful**
Sandbox agents need a supported way to sign in without host credentials.
An authorized owner completes the browser step and receives the token
one time.
**How the agent is invoked**
When a sandbox provider binds the injectable transport, the server
starts `claude setup-token` through a sandbox pseudo-terminal, sends the
browser code to the matched prompt, and returns the token through the
guarded session route. The default build does not bind the transport. In
that state the start route fails closed with a fixed no-secret `503`. It
does not start a process and it does not hold a sandbox lease.
**Additional context**
The transport is injectable, so each sandbox provider binds its own
pseudo-terminal. This pull request adds the Daytona transport but does
not bind it in the production server. A production wiring needs a lease
manager, a live pseudo-terminal factory, a durable token store, and its
own security review. The route keeps secrets out of logs, activity
details, errors, telemetry, and non-owner responses.
## What Changed
- Add strict parsers for the setup-token URL, the prompt, and the
success token.
- Add a login runner that drives the `claude setup-token` command
through a pseudo-terminal.
- Add the Daytona pseudo-terminal transport and the sandbox plugin
wiring.
- Add a company-scoped, owner-bound login session service with rate
limits, a reaper, cleanup, and one-time token delivery.
- Add the guarded session routes at
`/agents/:id/setup-token-login-sessions/*` behind an injectable
transport. The routes become the live login path only when a provider
binds the transport.
- Keep the start route fail-closed in the default build. It returns a
fixed no-secret `503` and it does not bind `setupTokenLogin`.
- Keep the existing host route `POST /agents/:id/claude-login` in place.
This pull request does not replace it.
- Keep confidential responses behind a fail-closed TLS transport guard
with `Cache-Control: no-store`, and extend redaction for the new fields.
- Export the parser and the runner from the Claude local server entry,
and document the new session routes in the OpenAPI spec.
## Verification
- `pnpm --filter @paperclipai/server exec vitest run setup-token-route
setup-token-session`
- `pnpm --filter @paperclipai/adapter-claude-local exec vitest run`
- `pnpm --filter @paperclipai/server run typecheck`
- Confirm that the pull request checks pass on GitHub.
## Risks
- Low user-facing risk on merge. The default build does not bind the
transport, so the production start route stays fail-closed with a `503`.
The merge does not change the production login behavior.
- When a provider later binds the transport, the flow starts a live
sandbox process and holds a short-lived in-memory secret. Cleanup must
stop the child before it releases the sandbox lease.
- The transport guard fails closed when the deployment does not provide
a trusted TLS path. A wrong proxy allowlist can block a valid request.
- The production wiring is out of scope. It needs a lease manager, a
live pseudo-terminal factory, a durable token store, and its own
security review before the server binds `setupTokenLogin`.
## Model Used
Anthropic Claude Opus 4.8 assisted the implementation. It used extended
reasoning, code execution, repository tool use, and a 200,000-token
context window.
## Checklist
- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have searched GitHub for duplicate or related PRs and linked
them above
- [x] I have either (a) linked existing issues with `Fixes: #` /
`Closes: #` / `Refs: #` OR (b) described the issue in-PR following the
relevant issue template
- [x] I have not referenced internal/instance-local Paperclip issues or
links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip`
URLs)
- [x] My branch name describes the change (e.g. `docs/...`, `fix/...`)
and contains no internal Paperclip ticket id or instance-derived details
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] I have updated relevant documentation to reflect my changes (the
OpenAPI spec covers the new session routes; no user-facing documentation
needs changes)
- [x] I have considered and documented any risks above
- [x] All Paperclip CI gates are green
- [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge
---------
Co-authored-by: Paperclip <noreply@paperclip.ing>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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