About

Imported from terminalskills/skills (skills/llamaindex/SKILL.md). Install upstream with npx skills add terminalskills/skills --skill llamaindex. Copyright stays with the author (Apache-2.0).

LlamaIndex

Name: llamaindex
Author: terminalskills

Overview

LlamaIndex is a data framework for building RAG pipelines, knowledge assistants, and data-augmented LLM applications. It provides document loading from 300+ sources, flexible chunking strategies, multiple index types, hybrid retrieval with reranking, and production evaluation tools for question-answering systems.

Instructions

When ingesting documents, use SimpleDirectoryReader for local files or LlamaHub connectors for SaaS platforms, and run through an IngestionPipeline with metadata extractors (title, summary) and deduplication.
When chunking, start with SentenceSplitter at 1024 tokens with 200 token overlap, use MarkdownNodeParser for structured documents, CodeSplitter for code, and adjust based on evaluation results.
When indexing, use VectorStoreIndex as the default for most RAG, KnowledgeGraphIndex for entity relationships, and DocumentSummaryIndex for per-document summaries.
When retrieving, implement hybrid retrieval (vector + keyword) for production, add a reranker (CohereRerank) after retrieval for improved relevance, and set similarity_top_k based on context window (3-5 for large models, 2-3 for smaller).
When building query engines, use RetrieverQueryEngine for standard RAG, CitationQueryEngine for responses with source attribution, and SubQuestionQueryEngine for complex multi-part queries.
When creating agents, use ReActAgent with tools wrapping query engines (QueryEngineTool), functions, and other agents for multi-step reasoning.
When evaluating, use CorrectnessEvaluator, FaithfulnessEvaluator, and RelevancyEvaluator on a test set before deploying.

Examples

Example 1: Build a RAG pipeline over company documentation

User request: "Create a question-answering system over our internal docs"

Actions:

Load documents with SimpleDirectoryReader and extract metadata (title, summary)
Chunk with SentenceSplitter (1024 tokens, 200 overlap) through an IngestionPipeline
Create VectorStoreIndex with OpenAI embeddings and configure hybrid retrieval
Build CitationQueryEngine for answers with source references

Output: A RAG system that answers questions with citations from company documentation.

Example 2: Create a multi-source research agent

User request: "Build an agent that can search across our docs, database, and web"

Actions:

Create separate query engines for each data source (vector index, SQL, web search)
Wrap each engine as a QueryEngineTool with descriptive tool descriptions
Build a ReActAgent that routes questions to the appropriate tool
Add SubQuestionQueryEngine for complex queries requiring multiple sources

Output: An intelligent agent that reasons about which data source to query and synthesizes multi-source answers.

Guidelines

Use SentenceSplitter with 1024 token chunks and 200 token overlap as the starting point.
Always add metadata extractors to the ingestion pipeline; title and summary metadata improve retrieval significantly.
Use hybrid retrieval (vector + keyword) for production; pure vector search misses exact term matches.
Add a reranker (CohereRerank) after retrieval to improve result relevance for small cost.
Evaluate with CorrectnessEvaluator on a test set before deploying; subjective quality assessment does not scale.
Set similarity_top_k based on context window: 3-5 chunks for large models, 2-3 for smaller models.
Use IngestionPipeline with deduplication for incremental data updates; do not re-embed unchanged documents.

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

yaml

targets:
  - https://api.opensmartroute.ai/api/v1/registry/terminalskills-skills-llamaindex/manifest   # or paste the manifest below

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

terminalskills-skills-llamaindex.ocm.jsonjson

{
  "ocm": "1",
  "id": "terminalskills-skills-llamaindex",
  "kind": "skill",
  "name": "llamaindex",
  "description": "Assists with building RAG pipelines, knowledge assistants, and data-augmented LLM applications using LlamaIndex. Use when ingesting documents, configuring retrieval strategies, building query engines, or creating multi-step agents. Trigger words: llamaindex, rag, retrieval augmented generation, vector index, query engine, document loader, knowledge base.",
  "publisher": "terminalskills",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "data_analysis"
    ],
    "tags": [
      "skill-md",
      "llamaindex",
      "rag",
      "llm",
      "retrieval",
      "knowledge-base",
      "skills-sh"
    ],
    "languages": [
      "en"
    ]
  },
  "quality_prior": 0.6,
  "examples": [
    "Assists with building RAG pipelines, knowledge assistants, and data-augmented LLM applications using LlamaIndex. Use when ingesting documents, configuring retrieval strategies, building query engines, or creating multi-step agents. Trigger words: llamaindex, rag, retrieval augmented generation, vector index, query engine, document loader, knowledge base."
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "skills.sh",
      "repository": "https://github.com/terminalskills/skills",
      "path": "skills/llamaindex/SKILL.md",
      "ref": "HEAD",
      "url": "https://github.com/terminalskills/skills/blob/HEAD/skills/llamaindex/SKILL.md",
      "key": "terminalskills/skills/skills/llamaindex/SKILL.md"
    },
    "compatibility": "Python 3.8+ or TypeScript/Node.js 18+",
    "license": "Apache-2.0"
  },
  "instructions": "# LlamaIndex\n\n## Overview\n\nLlamaIndex is a data framework for building RAG pipelines, knowledge assistants, and data-augmented LLM applications. It provides document loading from 300+ sources, flexible chunking strategies, multiple index types, hybrid retrieval with reranking, and production evaluation tools for question-answering systems.\n\n## Instructions\n\n- When ingesting documents, use `SimpleDirectoryReader` for local files or LlamaHub connectors for SaaS platforms, and run through an `IngestionPipeline` with metadata extractors (title, summary) and deduplication.\n- When chunking, start wi",
  "cost": {
    "context_tokens": 900
  }
}

Fetch it by URL: GET /api/v1/registry/terminalskills-skills-llamaindex/manifest?version=1.0.0

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