## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work
> - The `opencode-local` adapter runs the OpenCode harness; its
model/provider routing assumes built-in providers (anthropic/openai/...)
and their default models
> - Deployments increasingly put an OpenAI/Anthropic-compatible LLM
gateway between the harness and the model for cost, governance, or
data-residency reasons: LiteLLM, OpenRouter, Portkey, Kong, a corporate
proxy, self-hosted models (vLLM/Ollama), or region-pinned/sovereign
endpoints. But OpenCode only resolves `--model provider/model` when the
model is registered in a provider's `models` map, and
`OPENCODE_ALLOW_ALL_MODELS` does NOT bypass its internal `getModel()`
> - Several lanes also fall back to built-in default models the gateway
may not serve: the auxiliary/title model (e.g. `claude-haiku-*`) and the
budget/recovery "cheap" lane (`openai/gpt-5.1-codex-mini`); these abort
runs with "no keys found that support model"
> - This pull request makes the adapter's provider/model wiring
declarative via env, so any such deployment can register gateway models
+ pin the auxiliary/budget lanes without code changes; nothing here is
specific to one hosting setup
> - The benefit is OpenCode works behind any compatible gateway with
config only; with no env set, behavior is unchanged
## Linked Issues or Issue Description
No existing issue; describing in-PR (feature / adapter enhancement).
- **Gap:** there is no supported way to register custom/gateway
providers + models for `opencode-local`, nor to pin the auxiliary
(title-gen) and budget (recovery) model lanes, so routing OpenCode
through a gateway fails at `getModel()` or on the default helper models.
- Related: #5737 (exe.dev sandbox installs for gemini/opencode local),
#5823 (unblock claude_local on remote sandbox providers).
> Note on ROADMAP: this is adapter-level, opt-in config (defaults
unchanged) that *enables* gateway routing for one harness; it is not the
core "Cloud / Sandbox agents" platform work itself. Happy to
redirect/discuss in #dev if preferred.
## What Changed
- `PAPERCLIP_OPENCODE_PROVIDERS`: merge custom/extended providers
(OpenCode `provider` shape) into the runtime `opencode.json`, so gateway
models are registered and `--model provider/model` resolves. `{env:VAR}`
placeholders are expanded server-side (so a key need not depend on the
sandbox run env).
- A malformed `PAPERCLIP_OPENCODE_PROVIDERS` is no longer silently
ignored: invalid JSON, a non-object value, and individual provider
entries with non-object values (which are skipped by name) each append a
visible note to the run notes so the misconfiguration is diagnosable
(addresses both review P1s).
- `PAPERCLIP_OPENCODE_SMALL_MODEL` / `PAPERCLIP_OPENCODE_CHEAP_MODEL`:
pin the auxiliary (title-generation) and budget (recovery-retry) lanes
to gateway-served models; defaults unchanged.
- Honour `OPENCODE_ALLOW_ALL_MODELS` on the **remote** execution path
too (was local-only, a parity gap).
- `PAPERCLIP_OPENCODE_PRINT_LOGS`: optional toggle adding `--print-logs`
so OpenCode logs surface on stderr for diagnosing remote/sandbox runs.
- `buildOpenCodeModelProfiles()` guards its `process.env` default with
`typeof process` so the shared client/server module stays browser-safe
(a bare `process.env` at module load threw ReferenceError in the browser
under Vite dev middleware and broke UI rendering in the e2e lane).
## Verification
- `pnpm --filter @paperclipai/adapter-opencode-local build` and
`typecheck` (tsc clean)
- `pnpm exec vitest run packages/adapters/opencode-local/src` shows 33
passing (incl. new tests for the provider merge, `{env:}` expansion, the
malformed/non-object/skipped-entry provider notes, small/cheap-model
resolution, and the remote allow-all bypass)
- Manually verified end-to-end against a real
OpenAI-/Anthropic-compatible gateway: with the providers + small/cheap
model set, both the title-gen and main task route to the configured
gateway model and the agent completes (a real completion is returned and
billed). That deployment supplies the verification evidence; the
mechanism is gateway-agnostic.
## Risks
Low. Everything is env-driven and opt-in; with no env set the generated
config output is unchanged, and the cheap model profile keeps its model
(the only difference is its updated human-readable description).
Defaults preserved: built-in providers, Codex-mini cheap lane with
`variant: low`, no `--print-logs`. No migration/UI impact.
## Model Used
Claude Opus 4.8 (`claude-opus-4-8`, 1M context), extended thinking +
tool use, via Claude Code.
## 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 (adapter-level opt-in config enabling
gateway routing; not the core sandbox-platform work, noted above)
- [x] I have searched GitHub for duplicate or related PRs and linked
them above (#5737, #5823)
- [x] I have either (a) linked existing issues OR (b) described the
issue in-PR following the relevant issue template
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [ ] If this change affects the UI, I have included before/after
screenshots (n/a, no UI)
- [ ] I have updated relevant documentation to reflect my changes (env
vars documented inline via comments; no central doc references the
adapter env yet)
- [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
(the P1 about silently dropped malformed providers JSON is addressed in
6eeb803, the follow-up P1 about silently skipped non-object entries in
2f4045a; the latest review has no further findings, and a re-review is
requested for the final note-copy/test-fixture polish at head)
- [x] I will address all Greptile and reviewer comments before
requesting merge
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jannes Stubbemann
1ac1ba5442