embed
Receives a text question and returns its embedding vector using gemini-embedding-001 via Vertex AI. Use this when you need a semantic embedding for a question — for downstream vector search, similarity comparison, or passing to another tool.
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- Repository
- mozilla/rag-skills
- Last source activity
- June 25, 2026 at 13:30
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- English
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- 2
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- 2
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- Receives a text question and returns its embedding vector using gemini-embedding-001 via Vertex AI. Use this when you need a semantic embedding for a question — for downstream vector search, similarity comparison, or passing to another tool.
# Embed Skill
Embeds a text question using `gemini-embedding-001` (Vertex AI, project `mozdata`) and returns the resulting vector as a JSON array.
## Usage
```bash
python "${CLAUDE_PLUGIN_ROOT:?set by the plugin system; if empty, invoke this via the Skill tool}"/skills/embed/scripts/embed.py --question "<your question>"
```
``
Output is a JSON array of 3072 floats printed to stdout:
```json
[0.012, -0.034, 0.091, ...]
```
## Steps
1. Run the script with the user's question as `--question`.
2. Capture stdout — that is the embedding vector.
3. Return or pass the vector as needed (e.g. to the `vector-search` skill).
## Authentication
This skill connects to Vertex AI using a service account — the `cloud-platform` scope is enforced on the impersonated token in code. Just log in:
```bash
gcloud auth application-default login
```
Your authenticated Google Cloud credentials are only used to create a new and temporary access token on behalf of the service account defined in `SERVICE_ACCOUNT`, which requires the `roles/iam.serviceAccountTokenCreator` role on that service account. Your login no longer needs `--scopes`.
## Troubleshooting
| Symptom | Fix |
|---------|-----|
| `GCP authentication required` / `API error 401` | Re-run `gcloud auth application-default login`; confirm you have `roles/iam.serviceAccountTokenCreator` on the service account in `SERVICE_ACCOUNT` |
| `Missing dependency` | `pip install google-auth requests` |
| `Unexpected response from Vertex AI` | Confirm Vertex AI is enabled in project `mozdata` and the embedding model is available |
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