## Thinking Path
> - Paperclip is the control plane for companies that use AI agents for
work
> - Local adapters connect Paperclip agents to provider command line
tools
> - The Codex adapter stores login data in a shared company home
> - A shared home cannot keep credentials for more than one Codex
account
> - This pull request gives each account a safe home and a matching
company secret
> - The benefit is that one company can use multiple Codex accounts at
the same time
## Linked Issues or Issue Description
**Problem or motivation**
A company can hold only one Codex subscription credential because device
login uses one shared home. A second account cannot log in without
replacing or conflicting with the first credential.
**Proposed solution**
This change validates the vendor account identifier, stores each
credential in its own home, and creates a company secret that points to
that home. Repeat login calls return success when the matching secret
already exists.
**Roadmap alignment**
The change supports the roadmap goal for centrally managed secrets with
scoped access and audited resolution.
**Additional context**
The security review returned approve with no blocking finding. The
branch adds shared account-handle validation and tests for device login
and the Codex local adapter.
## What Changed
- Add strict allowlist validation for Codex account handles.
- Store each Codex account credential in a separate home under the Codex
cache root.
- Verify that the resolved account home stays inside the cache root.
- Create the `CODEX_HOME_<handle>` company secret for each account.
- Keep repeat and concurrent login calls safe and idempotent.
- Add shared helper and route, adapter, and validation tests.
## Verification
- `pnpm --filter @paperclipai/adapter-codex-local test` passes with 343
tests.
- `pnpm --filter @paperclipai/server test
src/__tests__/agent-device-login-routes.test.ts` passes with 25 tests.
- The adapter suite passes with 23 tests.
- The shared package and Codex adapter typechecks pass.
- Continuous integration must pass on every check before merge.
## Risks
The account handle becomes part of a directory path and secret name. The
strict allowlist and root containment check reduce path traversal risk.
Existing single-account homes remain unchanged unless a new device login
creates an account-specific home.
## Model Used
OpenAI GPT-5 (exact runtime model ID: gpt-5), with tool use and code
execution. The runtime context window is not exposed in this run.
## 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
- [x] I have considered and documented any risks above
- [x] All Paperclip CI gates are green
- [ ] 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>
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