## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work
> - Agents pick their model from a dropdown in agent config, populated
per-adapter by `listAdapterModels()` → each adapter's live provider
catalog merged over a static fallback list
> - For `claude_local`, newer model ids only reach the dropdown via the
live Anthropic `/v1/models` fetch, which needs a server
`ANTHROPIC_API_KEY`, a <5s round-trip, non-Bedrock mode, and account
entitlement; on any miss it silently falls back to the static `models`
array
> - Claude Sonnet 5 (`claude-sonnet-5`) is a current flagship but was
absent from that static fallback, so it appeared only when live
discovery happened to succeed — i.e. "the newest model doesn't
consistently show up"
> - This pull request adds `claude-sonnet-5` to the `claude_local`
static model list so it is selectable regardless of the live-discovery
path
> - The benefit is a consistent, reliable dropdown that no longer
depends on a flaky live fetch to surface a shipped flagship model
## Linked Issues or Issue Description
No public GitHub issue. The bug is described inline following the
bug-report template:
**What happened**
The `claude_local` agent-config model dropdown intermittently omitted
Claude Sonnet 5. `claude-sonnet-5` was missing from the adapter's static
fallback `models` array (`packages/adapters/claude-local/src/index.ts`),
so it only surfaced when the live Anthropic `/v1/models` discovery
happened to succeed.
**Expected behavior**
Claude Sonnet 5 is a shipped flagship model and should always be
selectable in the dropdown, independent of whether live discovery
succeeds.
**Steps to reproduce**
1. Run the server without a working live Anthropic `/v1/models` path (no
`ANTHROPIC_API_KEY`, Bedrock mode, a discovery timeout, or a cache
miss).
2. Open agent config for a `claude_local` agent and inspect the model
dropdown.
3. Observe that `claude-sonnet-5` is absent because the static fallback
list omitted it.
**Deployment mode**
Self-hosted / local adapter (`claude_local`); the server process reads
`ANTHROPIC_API_KEY` from its environment.
## What Changed
- Added `{ id: "claude-sonnet-5", label: "Claude Sonnet 5" }` to the
`claude_local` static `models` fallback, immediately after
`claude-opus-4-8` (so Opus 4.8 stays the default first option).
- Added an explicit regression assertion in
`server/src/__tests__/adapter-models.test.ts` that `claude-sonnet-5` is
present in the `claude_local` fallback when live discovery is
unavailable.
## Verification
- `pnpm -C server exec vitest run src/__tests__/adapter-models.test.ts
-t "claude fallback"` — **passes** (the new `claude-sonnet-5` assertion
included).
- Reviewed the consuming tests: the fallback test also asserts
`models[0]?.id === "claude-opus-4-8"` (still index 0 — Sonnet 5 is index
1, unaffected); `adapter-registry.test.ts` reads `builtIn?.models`
dynamically, so no exact-array snapshot breaks.
- Change is a single static-data addition plus a test assertion; no
control-flow change.
## Risks
- Low risk. Pure additive change to a fallback list; no control-flow
change. Worst case is an id that a given account isn't entitled to,
which the existing "current"/manual-model UI paths already tolerate.
## Model Used
Claude (Anthropic), model id `claude-opus-4-8` (Opus 4.8), extended
thinking + tool use, run as the Paperclip CTO agent.
## 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)
- [ ] My branch name describes the change (branch is the assigned
execution-workspace branch and cannot be renamed this run)
- [x] I have run tests locally and they pass (server adapter-models
"claude fallback" case)
- [x] I have added or updated tests where applicable (explicit
`claude-sonnet-5` fallback assertion)
- [x] I have updated relevant documentation to reflect my changes (n/a —
no docs reference this list)
- [x] I have considered and documented any risks above
- [ ] All Paperclip CI gates are green (pending CI)
- [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
(pending review)
- [x] I will address all Greptile and reviewer comments before
requesting merge
---------
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Co-authored-by: Paperclip <noreply@paperclip.ing>
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