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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - Agent adapters (Claude, Codex, Gemini) default to the ACP engine lane, which needs a live bidirectional stdio session with the agent process > - Sandbox execution targets only exposed one-shot command execution, so every ACP-capable adapter refused remote targets and fell back to the CLI lane with a "supports only the local Paperclip host" warning > - Running agents in sandboxes is a core deployment mode, and losing ACP there means losing streaming updates, structured events, and default-lane parity with local runs > - This pull request adds a provider-agnostic process-session bridge that relays the ACP stdio session into the sandbox over the existing sandbox runner contract, and updates the adapters to use it > - The benefit is that the default ACP lane now behaves the same on the local host and in any sandbox provider, with CLI fallback reserved for targets that genuinely cannot host a bidirectional session ## Linked Issues or Issue Description No existing public issue covers this; inline description following the feature request template: **Problem or motivation** Configuring an ACP-capable adapter (e.g. Claude) with a sandbox environment made every run fall back to the CLI lane with the warning "Claude ACP currently supports only the local Paperclip host, but this run targets a remote environment." The ACP engine only knew how to spawn a local subprocess, while sandbox providers only expose one-shot command execution — so there was no way to hold the bidirectional stdio session ACP requires. **Proposed solution** Add a process-session bridge in `adapter-utils`: a local ACPX-spawnable proxy script connects to a token-authenticated loopback TCP server, which relays JSON-framed stdin/stdout/stderr events to and from a small relay script executed inside the sandbox via the provider's ordinary runner. Claude/Codex/Gemini adapters now treat sandbox targets with a runner as ACP-capable, resolve agent commands against the remote target, and fall back to CLI only when the sandbox exposes no bidirectional path. The sandbox callback bridge injects a run-scoped API endpoint and bridge token so the agent inside the sandbox can reach Paperclip (including work-product handoffs) without ever receiving the host run JWT. **Alternatives considered** A provider-specific lane was prototyped first: Daytona minting SSH access metadata at lease time, converted into an SSH execution target. It was dropped because it only worked for providers able to advertise SSH, added per-provider surface area, and left every other sandbox provider on the CLI fallback. The merged design rides the one-shot runner contract all providers already implement; a regression test pins that sandbox targets stay on the bridge lane even when lease metadata advertises SSH access. **Roadmap alignment** Directly advances the "Cloud / Sandbox agents" roadmap item — agents running in remote and sandboxed environments keep the same control-plane behavior as local ones. No overlap with other planned core work. ## What Changed - `packages/adapter-utils/src/execution-target.ts`: new `startAdapterExecutionTargetProcessSessionBridge()` plus helpers — writes a token-authenticated local proxy script (spawnable by ACPX) and a remote relay script synced into the sandbox, with a loopback TCP server streaming JSON-framed stdio between them; events emitted before the ACP client attaches are buffered so none are lost. - `packages/adapter-utils/src/acpx-engine/execute.ts`: the ACP engine can execute against remote sandbox targets through the bridge instead of requiring a local subprocess, including remote cwd/env shaping. - `packages/adapter-utils/src/sandbox-callback-bridge.ts`: sandbox-scoped API bridging extended to allow work-product handoffs; the sandbox payload env carries a bridge token, never the host run JWT. - `packages/adapters/claude-local`, `codex-local`, `gemini-local` (`src/server/acp.ts`): default-lane selection no longer rejects all remote targets; command resolution is remote-aware (`ensureAdapterExecutionTargetCommandResolvable`, `resolveAdapterExecutionTargetCwd`); the fallback reason is now scoped to sandboxes that expose only one-shot execution. - `server/src/__tests__/environment-execution-target.test.ts`: pins that sandbox targets resolve to the bridge lane, including when lease metadata advertises SSH access. - Non-sandbox remote targets (e.g. SSH) keep the CLI lane: the ACP engine's remote transport is sandbox-only, so default-lane selection falls back for those targets across all three adapters, and tests covering CLI-specific remote behavior pin `engine: "cli"` explicitly. - The bridge authenticates loopback connections before they can own the session or receive buffered output (token required, idle unauthenticated peers dropped), and remote event writes are serialized so the exit event always lands after stdout/stderr have drained. - Daytona plugin: formatting-only residue from the earlier iteration; no functional change. ## Verification - `vitest run` over the touched suites — `packages/adapter-utils/src/acpx-engine/execute.test.ts`, `packages/adapter-utils/src/execution-target-sandbox.test.ts`, `packages/adapter-utils/src/sandbox-callback-bridge.test.ts`, the three adapter `acp.test.ts` files, and `server/src/__tests__/environment-execution-target.test.ts` — 102 tests pass. - End to end: with a Claude agent configured on a Daytona sandbox environment, the primary-model test now selects the default ACP lane (no fallback warning), and the full round trip (wake → sandbox execution → API bridge → comment post) was exercised twice from inside a live sandbox. ## Risks - Behavioral shift: adapters that previously always fell back to CLI on sandbox targets now default to ACP there; `engine=cli` still pins the CLI lane explicitly. - The bridge relays stdio as JSON lines over loopback TCP guarded by a per-session random token; the remote relay runs inside the sandbox under the provider's runner. Providers with slow one-shot execution will see higher session startup latency — the CLI fallback remains for genuinely incapable targets. - No schema or migration changes. ## Model Used - Claude Fable 5 (`claude-fable-5`, Anthropic) — extended thinking enabled, agentic tool use via the Claude Agent SDK harness; implementation iterated with local Vitest verification. ## 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 (no shipped docs describe the old local-only ACP limitation) - [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: Cody <noreply@paperclip.ing> Co-authored-by: Cody <cody@paperclip.local> |
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README.md
@paperclipai/plugin-daytona
Published Daytona sandbox provider plugin for Paperclip.
This package lives in the Paperclip monorepo, but it is intentionally excluded from the root pnpm workspace and shaped to publish and install like a standalone npm package. That lets operators install it from the Plugins page by package name without introducing root lockfile churn for Daytona's SDK dependencies.
Install
From a Paperclip instance, install:
@paperclipai/plugin-daytona
The host plugin installer runs npm install into the managed plugin directory, so transitive dependencies such as @daytonaio/sdk are pulled in during installation.
Configuration
Configure Daytona from Instance Settings -> Environments, not from the plugin's plugin page.
- Put the Daytona API key on the sandbox environment itself.
- When you save an environment, Paperclip stores pasted API keys as company secrets.
DAYTONA_API_KEYremains an optional host-level fallback when an environment omits the key.- Optional
apiUrlandtargetsettings map directly to the Daytona SDK/client configuration. IfapiUrlis omitted, the Daytona SDK uses its default endpoint.
Notes:
- The current published Daytona SDK package is
@daytonaio/sdk. - The driver supports both
snapshot-based andimage-based sandbox creation. If both are set, validation rejects the config as ambiguous. - Reusable leases map to Daytona stop/start semantics. Non-reusable leases are deleted on release.
Local development
cd packages/plugins/sandbox-providers/daytona
pnpm install --ignore-workspace --no-lockfile
pnpm build
pnpm test
pnpm typecheck
These commands assume the repo root has already been installed once so the local @paperclipai/plugin-sdk workspace package is available to the compiler during development.
Package layout
src/manifest.tsdeclares the sandbox-provider driver metadatasrc/plugin.tsimplements the environment lifecycle hookspaperclipPlugin.manifestandpaperclipPlugin.workerpoint the host at the built plugin entrypoints indist/