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docs: update USING_GBRAIN_WITH_GSTACK for v1.43.1.0 voyage-code-3 default

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Add VOYAGE_API_KEY row to the env-var table; clarify the OPENAI_API_KEY row as
the fallback path. Refresh the "search returns nothing semantic" troubleshooting
to mention both providers and clarify that the env-shim only promotes
ANTHROPIC/OPENAI from GSTACK_ — VOYAGE_API_KEY must be set directly in Conductor
workspace env.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Garry Tan
2026-05-21 08:47:47 -07:00
parent 88b4bfa5f1
commit 4887453cdf
1 changed files with 3 additions and 2 deletions
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USING_GBRAIN_WITH_GSTACK.md
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@@ -253,7 +253,8 @@ Gbrain itself ships with these that gstack wraps:
| `SUPABASE_API_BASE` | `gstack-gbrain-supabase-provision` | Override the Management API host. Used by tests to point at a mock server. |
| `GBRAIN_INSTALL_DIR` | `gstack-gbrain-install` | Override default install path (`~/gbrain`) |
| `GSTACK_HOME` | every bin helper | Override `~/.gstack` state dir. Heavy test use. |
| `OPENAI_API_KEY` | `gbrain embed` subprocess | Required for embeddings during `gbrain sync` / `/sync-gbrain`. Without it, pages are imported structurally (symbol tables, chunks) but semantic search degrades — you'll see `[gbrain] embedding failed for code file ... OpenAI embedding requires OPENAI_API_KEY` in the sync log. |
| `VOYAGE_API_KEY` | `gbrain embed` subprocess; gstack PGLite init | When set, gstack inits PGLite with `voyage-code-3` (1024-dim), Voyage's code-specialized embedding model. Beats `voyage-4-large` and OpenAI `text-embedding-3-large` head-to-head on this codebase's symbol queries. See CHANGELOG v1.43.1.0 for the A/B numbers. |
| `OPENAI_API_KEY` | `gbrain embed` subprocess | Used for embeddings during `gbrain sync` / `/sync-gbrain` when `VOYAGE_API_KEY` is not set (gbrain's auto-selected fallback, `text-embedding-3-large` 1536-dim). Without either key, pages are imported structurally (symbol tables, chunks) but semantic search degrades — you'll see `[gbrain] embedding failed for code file ...` in the sync log. |
| `ANTHROPIC_API_KEY` | `claude-agent-sdk`, paid evals | Required for `bun run test:evals` and any direct `query()` call against Claude. |
| `GSTACK_OPENAI_API_KEY` | `lib/conductor-env-shim.ts` | Conductor-injected fallback. Promoted to `OPENAI_API_KEY` when the canonical name is empty. |
| `GSTACK_ANTHROPIC_API_KEY` | `lib/conductor-env-shim.ts` | Same pattern as above for Anthropic. |
@@ -347,7 +348,7 @@ Embeddings probably failed during import. Symbol queries (`code-def`, `code-refs
[gbrain] embedding failed for code file <name>: OpenAI embedding requires OPENAI_API_KEY
```
The fix is to put `OPENAI_API_KEY` in the process env before re-running. On a bare Mac shell, source it from `~/.zshrc` before calling. In Conductor, set `GSTACK_OPENAI_API_KEY` at the workspace level — `lib/conductor-env-shim.ts` promotes it to canonical automatically when imported. Re-run `/sync-gbrain --code-only` to backfill embeddings on already-imported pages.
The fix is to put a provider API key in the process env before re-running. `VOYAGE_API_KEY` is preferred for code (gstack defaults PGLite to `voyage-code-3` when set); otherwise `OPENAI_API_KEY` falls back to `text-embedding-3-large`. On a bare Mac shell, source the key from `~/.zshrc` before calling. In Conductor, the `lib/conductor-env-shim.ts` shim promotes `GSTACK_ANTHROPIC_API_KEY` / `GSTACK_OPENAI_API_KEY` to their canonical names automatically; for `VOYAGE_API_KEY`, set it directly in your Conductor workspace env. Re-run `/sync-gbrain --code-only` to backfill embeddings on already-imported pages.
### `gbrain sync` blocked at a commit hash — `FILE_TOO_LARGE`