DevPilot – Switch Agents, Keep the Context

Illustrative handoff adapted from the example bundled with DevPilot; project paths, commits, test results, and CI status below are example data, not a newly verified session.

Context Handoff: Claude Code -> Gemini CLI

Generated: 2026-04-07 14:32 UTC
Source Agent: Claude Code
Target Agent: Gemini CLI
Project: /Users/dev/acme-api

Session Summary

Claude Code session focused on implementing the OAuth2 authentication flow for the web application. The core auth middleware, JWT handling, and provider configuration are complete and all unit tests pass. The remaining work involves updating API documentation and writing integration tests — tasks well-suited for Gemini CLI's large context window.

Project Context

• Stack: Node.js 20, Express.js 4.19, TypeScript 5.4, PostgreSQL 16 via Prisma 5.x
• Package Manager: pnpm
• Test Runner: Vitest

Git State

• Branch: feature/oauth2-login (3 commits ahead of main)
• Last commit: a1b2c3d — "add OAuth2 provider abstraction with Google and GitHub support"
• Uncommitted changes: none
• CI status: all checks passing

Files Changed in This Session

Decisions Made

RS256 over HS256: Switched to asymmetric JWT signing for better security in distributed environments. Public key is served at /.well-known/jwks.json.

Rate limiting strategy: Per-user (100 req/min) and per-IP (1000 req/min) using sliding window algorithm. Counters stored in-memory for now (Redis migration is a TODO).

Refresh token storage: Refresh tokens are stored in httpOnly, secure, sameSite=strict cookies. NOT in localStorage. Access tokens are returned in response body only.

OAuth provider pattern: Used strategy pattern — each provider implements OAuthProvider interface. Adding a new provider requires only a new class in src/services/oauth/providers/.

Token lifetimes: Access tokens expire after 15 minutes. Refresh tokens expire after 7 days. Refresh token rotation is enabled (old token invalidated on use).

Architecture Notes

Client Request

    |

    v
rate-limit.ts (check IP + user limits)

    |

    v
auth.ts (verify JWT with RS256 public key)

    |

    v
Route Handler

    |

    v
oauth.ts (for OAuth routes only)

    |-- providers/google.ts

    +-- providers/github.ts

Key Code Snippets

OAuthProvider Interface (src/types/auth.d.ts)

interface OAuthProvider {
  name: string;
  authorizeUrl(state: string): string;
  exchangeCode(code: string): Promise<OAuthTokens>;
  getUserInfo(accessToken: string): Promise<OAuthUserInfo>;
}

Rate Limit Configuration (src/middleware/rate-limit.ts)

const RATE_LIMITS = {
  perUser: { windowMs: 60_000, max: 100 },
  perIP: { windowMs: 60_000, max: 1000 },
};

Remaining Tasks

These are the tasks recommended for Gemini CLI, leveraging its large context window:

• Update API documentation (docs/api-reference.md)

  • Document the new /auth/oauth/:provider endpoint
  • Document the /auth/refresh endpoint
  • Document the /.well-known/jwks.json endpoint
  • Add OAuth flow sequence diagram
  • Update authentication section with RS256 details

• Review full codebase for breaking changes

  • The JWT validation change from HS256 -> RS256 may affect other services
  • Check if any existing middleware assumes symmetric JWT
  • Review src/routes/*.ts for any hardcoded auth assumptions

• Write integration tests (tests/integration/oauth.test.ts)

  • Full OAuth flow with mocked providers
  • Refresh token rotation
  • Rate limiting under concurrent requests
  • Token expiration edge cases

Open Questions

These need decisions before the integration tests can be finalized:

Redis for rate limiting? — Currently using in-memory store. Works fine for single-instance deployments, but will need Redis for horizontal scaling. Should this be done now or deferred?

OAuth provider scope — Currently supporting Google and GitHub. Should we add Microsoft/Apple before v1 launch, or defer to post-launch?

Error message i18n — Auth error messages are currently English-only. The frontend team wants i18n support. Should error codes be returned instead of human-readable messages?

Continue in the target agent

Review this handoff, open the same project in Gemini CLI, and provide the document using the file-input method supported by your installed version. Ask: “Continue from this handoff. Review the remaining tasks and begin with the API documentation update.”