gemini-embeddings

name	gemini-embeddings
description	Generate text embeddings using Gemini Embedding API via scripts/. Use for creating vector representations of text, semantic search, similarity matching, clustering, and RAG applications. Triggers on "embeddings", "semantic search", "vector search", "text similarity", "RAG", "retrieval".
license	MIT
version	1.0.0
keywords	embeddings, semantic search, vector, similarity, clustering, RAG, retrieval, cosine similarity, gemini-embedding-001

Gemini Embeddings

Generate high-quality text embeddings for semantic search, similarity analysis, clustering, and RAG (Retrieval Augmented Generation) applications through executable scripts.

When to Use This Skill

Use this skill when you need to:

• Find semantically similar documents or texts
• Build semantic search engines
• Implement RAG (Retrieval Augmented Generation)
• Cluster or group similar documents
• Calculate text similarity scores
• Power recommendation systems
• Enable semantic document retrieval
• Create vector databases for AI applications

Available Scripts

scripts/embed.js

Purpose: Generate embeddings and calculate similarity

When to use:

• Creating vector representations of text
• Comparing text similarity
• Building semantic search systems
• Implementing RAG pipelines
• Clustering documents

Key parameters:

Parameter	Description	Example
texts	Text(s) to embed (required)	"Your text here"
--model, -m	Embedding model	gemini-embedding-001
--task, -t	Task type	SEMANTIC_SIMILARITY
--dim, -d	Output dimensionality	768, 1536, 3072
--similarity, -s	Calculate pairwise similarity	Flag
--json, -j	Output as JSON	Flag

Output: Embedding vectors or similarity scores

Workflows

Workflow 1: Single Text Embedding

node scripts/embed.js "What is the meaning of life?"

• Best for: Basic embedding generation
• Output: Vector with 3072 dimensions (default)
• Use when: Storing single document vectors

Workflow 2: Semantic Search

# 1. Generate embedding for query
node scripts/embed.js "best practices for coding" --task RETRIEVAL_QUERY > query.json

# 2. Generate embeddings for documents (batch)
node scripts/embed.js "Coding best practices include version control" "Clean code is essential" --task RETRIEVAL_DOCUMENT > docs.json

# 3. Compare and find most similar (calculate similarity separately)

• Best for: Building search functionality
• Task types: RETRIEVAL_QUERY, RETRIEVAL_DOCUMENT
• Combines with: Similarity calculation for ranking

Workflow 3: Text Similarity Comparison

node scripts/embed.js "What is the meaning of life?" "What is the purpose of existence?" "How do I bake a cake?" --similarity

• Best for: Comparing multiple texts, finding duplicates
• Output: Pairwise similarity scores (0-1)
• Use when: Need to rank text similarity

Workflow 4: Dimensionality Reduction for Efficiency

node scripts/embed.js "Text to embed" --dim 768

• Best for: Faster storage and comparison
• Options: 768, 1536, or 3072 (default)
• Trade-off: Lower dimensions = less accuracy but faster

Workflow 5: Document Clustering

# 1. Generate embeddings for multiple documents
node scripts/embed.js "Machine learning is AI" "Deep learning is a subset" "Neural networks power AI" --json > embeddings.jsonl

# 2. Process embeddings with clustering algorithm (your code)
# Use scikit-learn, KMeans, etc.

• Best for: Grouping similar documents, topic discovery
• Task type: CLUSTERING
• Combines with: Clustering libraries (scikit-learn)

Workflow 6: RAG Implementation

# 1. Create document embeddings (one-time setup)
node scripts/embed.js "Document 1 content" "Document 2 content" --task RETRIEVAL_DOCUMENT --dim 1536

# 2. For each query, find similar documents
node scripts/embed.js "User query here" --task RETRIEVAL_QUERY

# 3. Use retrieved documents in prompt to LLM (gemini-text)
node skills/gemini-text/scripts/generate.js "Context: [retrieved docs]. Answer: [user query]"

• Best for: Building knowledge-based AI systems
• Combines with: gemini-text for generation with context

Workflow 7: JSON Output for API Integration

node scripts/embed.js "Text to process" --json

• Best for: API responses, database storage
• Output: JSON array of embedding vectors
• Use when: Programmatic processing required

Workflow 8: Batch Document Processing

# 1. Create JSONL with documents
echo '{"text": "Document 1"}' > docs.jsonl
echo '{"text": "Document 2"}' >> docs.jsonl

# 2. Process with script or custom code
python3 << 'EOF'
import json
from google import genai

client = genai.Client()

texts = []
with open("docs.jsonl") as f:
    for line in f:
        texts.append(json.loads(line)["text"])

response = client.models.embed_content(
    model="gemini-embedding-001",
    contents=texts,
    task_type="RETRIEVAL_DOCUMENT"
)

embeddings = [e.values for e in response.embeddings]
print(f"Generated {len(embeddings)} embeddings")
EOF

• Best for: Large document collections
• Combines with: Vector databases (Pinecone, Weaviate)

Parameters Reference

Task Types

Task Type	Best For	When to Use
SEMANTIC_SIMILARITY	Comparing text similarity	General comparison tasks
RETRIEVAL_DOCUMENT	Embedding documents	Storing documents for retrieval
RETRIEVAL_QUERY	Embedding search queries	Finding similar documents
CLASSIFICATION	Text classification	Categorizing text
CLUSTERING	Grouping similar texts	Document clustering

Dimensionality Options

Dimensions	Use Case	Trade-off
768	High-volume, real-time	Lower accuracy, faster
1536	Balanced performance	Good accuracy/speed balance
3072	Highest accuracy	Slower, more storage

Similarity Scores

Score	Interpretation
0.8 - 1.0	Very similar (likely duplicates)
0.6 - 0.8	Highly related (same topic)
0.4 - 0.6	Moderately related
0.2 - 0.4	Weakly related
0.0 - 0.2	Unrelated

Output Interpretation

Embedding Vector

• Format: List of float values (768, 1536, or 3072)
• Range: Typically -1.0 to 1.0
• Normalized for cosine similarity
• Can be stored in vector databases

Similarity Output

Pairwise Similarity:
  'What is the meaning of life?...' <-> 'What is the purpose of existence?...': 0.8742
  'What is the meaning of life?...' <-> 'How do I bake a cake?...': 0.1234

• Higher scores = more similar
• Use threshold (e.g., 0.7) for matching

JSON Output

[[0.123, -0.456, 0.789, ...], [0.234, -0.567, 0.890, ...]]

• Array of embedding vectors
• One per input text
• Ready for database storage

Common Issues

"google-genai not installed"

npm install @google/genai@latest dotenv@latest

"numpy not installed" (for similarity)

pip install numpy

"Invalid task type"

• Use available tasks: SEMANTIC_SIMILARITY, RETRIEVAL_DOCUMENT, RETRIEVAL_QUERY, CLASSIFICATION, CLUSTERING
• Check spelling (case-sensitive)
• Use correct task for your use case

"Invalid dimension"

• Options: 768, 1536, or 3072 only
• Check model supports requested dimension
• Default to 3072 if unsure

"No similarity calculated"

• Need multiple texts for similarity comparison
• Use --similarity flag
• Check that at least 2 texts provided

"Embedding size mismatch"

• All embeddings must have same dimensionality
• Use consistent --dim parameter
• Recompute if dimensions differ

Best Practices

Task Selection

• SEMANTIC_SIMILARITY: General text comparison
• RETRIEVAL_DOCUMENT: Storing documents for search
• RETRIEVAL_QUERY: Querying for similar documents
• CLASSIFICATION: Categorization tasks
• CLUSTERING: Grouping similar content

Dimensionality Choice

• 768: Real-time applications, high volume
• 1536: Balanced choice for most use cases
• 3072: Maximum accuracy, offline processing

Performance Optimization

• Use lower dimensions for speed
• Batch multiple texts in one request
• Cache embeddings for repeated queries
• Precompute document embeddings for search

Storage Tips

• Use vector databases (Pinecone, Weaviate, Chroma)
• Normalize vectors for consistent comparison
• Store metadata with embeddings
• Index for fast retrieval

RAG Implementation

• Precompute document embeddings
• Use RETRIEVAL_DOCUMENT for docs
• Use RETRIEVAL_QUERY for user questions
• Combine top results with gemini-text

Similarity Thresholds

• 0.9+: Exact duplicates or near-duplicates
• 0.7-0.9: Same topic/subject
• 0.5-0.7: Related concepts
• <0.5: Different topics

Related Skills

• gemini-text: Generate text with retrieved context (RAG)
• gemini-batch: Process embeddings in bulk
• gemini-files: Upload documents for embedding
• gemini-search: Implement semantic search (if available)

Quick Reference

# Basic embedding
node scripts/embed.js "Your text here"

# Semantic search
node scripts/embed.js "Query" --task RETRIEVAL_QUERY

# Document embedding
node scripts/embed.js "Document text" --task RETRIEVAL_DOCUMENT

# Similarity comparison
node scripts/embed.js "Text 1" "Text 2" "Text 3" --similarity

# Dimensionality reduction
node scripts/embed.js "Text" --dim 768

# JSON output
node scripts/embed.js "Text" --json

Reference

• Get API key: https://aistudio.google.com/apikey
• Documentation: https://ai.google.dev/gemini-api/docs/embeddings
• Vector databases: Pinecone, Weaviate, Chroma, Qdrant
• Cosine similarity: Standard for embedding comparison