DEV: add Knowledge Assistant (RAG) agent type to agent builder

[mich-elle-luna]

Adds a third agent type — Knowledge Assistant — to the interactive agent builder, alongside the existing Recommendation Engine and Conversational Assistant. Includes Python and Node.js templates with Redis-native hybrid retrieval, semantic caching, session memory, and citations.

• Python template: single redis-py client (decode_responses=False), redisvl for index creation only, FT.SEARCH hybrid query with vector-only fallback, load_directory() helper, idempotent sample doc ingestion
• Node.js template: node-redis v4, same hybrid search pattern, loadDirectory() helper, ft.info() guard to skip re-ingestion on restart
• agent-builder.js: adds rag type to CONFIG, enables JavaScript alongside Python, fixes root-relative template URL, adds third suggestion chip
• agent-builder.html: adds Knowledge Assistant chip to initial message
• _index.md: updated to mention three agent types and JS support

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Note

Low Risk
Docs-site and static template changes only; no production auth or data-path changes beyond new example agent code for users to run locally.

Overview
Adds a Knowledge Assistant (RAG) as a third agent type in the interactive builder, with docs and UI updated to list three agent types and JavaScript (Node.js) alongside Python as supported output languages.

The builder flow now recognizes rag in CONFIG, shows a Knowledge Assistant suggestion chip, and treats JavaScript as a first-class choice (not Python-only). Template loading uses a Hugo-injected AGENT_TEMPLATE_BASE so fetches work with site base URLs.

New Python and Node.js rag_agent templates generate a full Knowledge Assistant: document chunking/ingestion, RediSearch hybrid retrieval (text filter + KNN with vector fallback), TTL semantic cache, session history in Redis Lists, and cited answers. Sample docs ingest only when the index is empty on startup.

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[github-actions]

Staging links:
https://redis.io/docs/staging/agent-builder-rag/develop/ai/agent-builder/

[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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^{Security scan by Jit}

[dwdougherty]

The complete example isn't displayed and it isn't downloadable or available for cut-and-paste. This kind of rings a bell - like we had this problem once before during initial development. 🤷🏻‍♂️

[dwdougherty]

The RAG example looks to be complete for both Python and JavaScript. But the other two show incomplete JavaScript code. I'm seeing these kinds of errors in the Chrome debugger's console:

Template file not found: /docs/staging/agent-builder-rag/code/agent-templates/javascript/recommendation_agent.js (404)

So what the JavaScript is showing is the default code that lives somewhere (in the static/js/agent-builder.js file maybe?).

[mich-elle-luna]

ah thanks, those are the new templates that are in my other PR I think

[CLAassistant]

All committers have signed the CLA.

[mich-elle-luna]

I tested both of these locally to make sure they work as well.

[andy-stark-redis]

@mich-elle-luna Visually OK as far as I can tell. Still a couple of Bugbot issues, though, and the Claude-Codex shuffle is worth a go, if you haven't already done it.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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