AgentLantern for VS Code

Illuminate your multi-agent LLM systems directly in the editor.

AgentLantern is built for AI agent projects across frameworks. It detects the framework, reads project files statically, and gives you documentation, lint diagnostics, inspection, and editor feedback without calling any LLM.

CrewAI currently has the deepest support. Other agent frameworks are detected and documented as their analyzers are expanded.

Features

Real-time Lint Diagnostics

Errors and warnings appear in the Problems panel as you save files. No manual run needed.

CrewAI currently has the full lint rule set:

E001 Task has no agent
W006 Missing required YAML field
W007 Unknown or misspelled field
W008 Wrong field type
…and 13 rules total

Code Lens

Where supported, AgentLantern shows one-line summaries above agent and task definitions. CrewAI crew.py files currently have the richest Code Lens support: role, tools, assigned tasks, and LLM without leaving the file.

🤖 Agent — Senior Data Analyst · tools: CSVSearchTool · tasks: analyze_data
def data_analyst(self) -> Agent:

Docs Preview

AgentLantern: Preview Docs regenerates the full documentation site and opens it in a VS Code side panel — overview, architecture, agents, tasks, diagrams, runbook.

Play and Replay

Launch the animated runtime viewer from VS Code:

AgentLantern: Play Live Run opens a terminal, runs lantern play ., and launches the Play UI.
AgentLantern: Replay Saved Run prompts for a replay name or .jsonl path and runs lantern replay.

These commands run in a VS Code terminal because Play and Replay are long-running local servers. Stop them with the UI STOP button or Ctrl+C in the terminal.

Command Palette

Command	What it does
`AgentLantern: Lint Project`	Run lint → Problems panel
`AgentLantern: Generate Docs`	Write docs to `docs/`
`AgentLantern: Preview Docs`	Generate + open WebView
`AgentLantern: Play Live Run`	Start `lantern play` in a VS Code terminal
`AgentLantern: Replay Saved Run`	Start `lantern replay` in a VS Code terminal
`AgentLantern: Inspect Project (JSON)`	Open raw project model

Requirements

VS Code 1.85+
Python 3.11+
AgentLantern CLI installed:

pip install agentlantern
# or (recommended)
uv tool install agentlantern

Configuration

Setting	Default	Description
`agentlantern.lanternPath`	`"lantern"`	Path to the `lantern` binary
`agentlantern.lintOnSave`	`true`	Auto-lint on Python / YAML save
`agentlantern.codeLensEnabled`	`true`	Show Code Lens where supported; strongest today for CrewAI `crew.py`

Supported Frameworks

Framework	Detection	Docs	Lint	Code Lens
CrewAI	✅	✅ Full	✅ Full	✅ agents + tasks
Google ADK	✅	✅ Full	Planned	Planned
LangGraph	✅	Basic	Planned	Planned
AutoGen	✅	Basic	Planned	Planned
Smolagents	✅	Basic	Planned	Planned

Troubleshooting

Diagnostics not appearing — verify lantern is on your PATH:

# In VS Code terminal
lantern --version

If not found, set agentlantern.lanternPath to the full binary path.

Code Lens not showing — ensure agentlantern.codeLensEnabled is true. CrewAI Code Lens currently expects the file to be named crew.py.

AgentLantern

Brell Sanwouo