MCP Deep Researcher

🔍 MCP Deep Researcher

A multi-agent research system that decomposes complex queries into targeted sub-questions, searches the web in parallel, scores source credibility, and synthesizes findings into structured markdown reports — accessible via Streamlit UI, MCP tool (Claude Code / Cursor), or Python API.

Try the live demo →

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What It Does

Give it a broad research question. It returns a structured report with executive summary, key findings, knowledge gaps, and cited sources — in about 10 seconds.

"What are the latest developments in multi-agent AI systems?"

↓

# Research Report: Multi-Agent AI Systems — Latest Developments

## Executive Summary
...

## Key Findings
### How are multi-agent frameworks evolving in 2026?
... [source](https://...) [credibility: high]

## Knowledge Gaps
- No peer-reviewed benchmarks comparing LangGraph vs CrewAI at scale
- ...

## Sources
1. https://arxiv.org/... [high]
2. https://techcrunch.com/... [medium]

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Architecture

Three-node LangGraph pipeline with typed state, parallel search, and 24-hour result caching:

┌──────────┐     ┌────────────────┐     ┌──────────────┐
│ Planner  │────▶│    Searcher    │────▶│ Synthesizer  │
│ (GPT-4o) │     │ (Tavily ×5)   │     │  (GPT-4o)    │
└──────────┘     └────────────────┘     └──────────────┘
     │                  │                      │
     ▼                  ▼                      ▼
 3-5 targeted    Parallel searches      Markdown report
 sub-questions   with credibility       with citations
                 scoring                and knowledge gaps

Planner — Decomposes the query into 3–5 non-overlapping sub-questions using GPT-4o structured output (Pydantic). Context-aware: follow-up queries build on prior research instead of repeating it.

Searcher — Fires all searches concurrently via ThreadPoolExecutor. Each result is tagged with a credibility score (high / medium / unverified) based on domain authority. Graceful per-question error handling.

Synthesizer — Analyzes all evidence, weights high-credibility sources when findings conflict, and produces a structured report at temperature=0.2 for consistency.

Cache — SHA-256 hash of (query + context + search depth). 24-hour TTL. Repeat queries return in <100ms.

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Quick Start

Prerequisites

• Python 3.11+
• API keys for OpenAI and Tavily

Install

git clone https://github.com/sid12super/MCP-Deep-Researcher.git
cd MCP-Deep-Researcher
uv sync
cp .env.example .env
# Add your API keys to .env

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Usage

Streamlit UI

streamlit run app.py

Opens at http://localhost:8501 with:

• Real-time progress tracking (planning → searching → synthesizing)
• Search depth toggle (basic / advanced)
• Multi-turn conversation with context carry-over
• Export full research conversation as HTML, PDF, or JSON
• "New Research Topic" button to reset context

MCP Server (Claude Code / Cursor)

The MCP server exposes the full research pipeline as a tool with Pydantic-validated input, search depth control, and multi-turn conversation support.

Start the server:

uv run server.py

Configure your MCP client — create .mcp.json in your project root:

{
  "mcpServers": {
    "deep_researcher_mcp": {
      "command": "uv",
      "args": [
        "--directory",
        "/absolute/path/to/MCP-Deep-Researcher",
        "run",
        "server.py"
      ],
      "env": {
        "OPENAI_API_KEY": "sk-...",
        "TAVILY_API_KEY": "tvly-..."
      }
    }
  }
}

Use it in Claude Code:

Use deep_researcher_research to find the latest developments in multi-agent AI systems

Use deep_researcher_research with search_depth "basic" for a quick comparison of LangGraph vs CrewAI

Use deep_researcher_research to follow up on that — pass the previous report as conversation_context

The tool accepts three parameters: | Parameter | Type | Default | Description | |-----------|------|---------|-------------| | query | string | required | Research question (3–2000 chars) | | search_depth | "basic" \| "advanced" | "advanced" | Speed vs. thoroughness tradeoff | | conversation_context | string | "" | Prior research for multi-turn follow-ups |

Python API

from agents import run_research

# Simple query
report = run_research("What are the latest AI trends in 2026?")

# With options
report = run_research(
    "How does this compare to 2025?",
    conversation_context="Previous findings: ...",
    search_depth="basic",
)

# Full state (for programmatic access)
result = run_research("Your query", return_full_state=True)
# result["report"], result["query"], result["research_questions"]

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Features

Search Depth Control

Toggle between basic (faster, ~8s) and advanced (comprehensive, ~14s) from the Streamlit sidebar or as an MCP parameter. Each depth caches separately.

Multi-turn Conversation

Follow-up queries automatically receive prior research context. The planner generates deeper, non-redundant questions instead of repeating covered ground. Reset anytime with "New Research Topic."

Export Formats

Download the full research conversation (all queries and reports) as:

• HTML — styled, web-ready
• PDF — professional, print-ready (via ReportLab)
• JSON — structured, machine-readable

Source Credibility Scoring

Every source is automatically classified:

• High — peer-reviewed, government, major outlets (arxiv.org, reuters.com, nih.gov, etc.)
• Medium — established tech/business (techcrunch.com, wikipedia.org, bloomberg.com, etc.)
• Unverified — everything else

The synthesizer weights high-credibility sources more heavily when findings conflict.

Real-time Progress

Streamlit UI shows live status updates as each pipeline stage completes — questions generated, results retrieved, report synthesized. Cache hits display instantly.

Caching

Results are cached by SHA-256 hash of (query + conversation context + search depth) with a 24-hour TTL. Identical requests return in <100ms at zero cost.

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Project Structure

├── agents.py          # LangGraph pipeline, nodes, caching, credibility scoring
├── server.py          # MCP server (FastMCP, Pydantic input, async)
├── app.py             # Streamlit UI (chat, exports, progress, sidebar)
├── pyproject.toml     # Dependencies (uv)
├── .env.example       # API key template
├── .mcp.json          # MCP client config (gitignored — contains keys)
├── CLAUDE.md          # Claude Code development context
└── test/              # Import, integration, and pipeline tests

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Performance

| Stage | Time | Notes | |-------|------|-------| | Planner | ~2-3s | GPT-4o structured output | | Searcher | ~2-3s | Parallel via ThreadPoolExecutor | | Synthesizer | ~5-8s | GPT-4o at temperature=0.2 | | Total | ~9-14s | First run | | Cached | <100ms | Repeat queries within 24h |

Cost per unique query: ~$0.06-0.10 (GPT-4o + Tavily) Cost per cached query: $0.00

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Troubleshooting

| Issue | Fix | |-------|-----| | ModuleNotFoundError | Run uv sync | | OpenAI API key not found | Check .env exists with OPENAI_API_KEY | | Tavily API error | Verify key at app.tavily.com | | Port 8501 in use | streamlit run app.py --server.port 8502 | | MCP server not found | Ensure .mcp.json is at project root (not inside .claude/) | | MCP server failed | Test with uv run server.py directly to see errors |

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Tech Stack

| Component | Technology | |-----------|-----------| | Agent orchestration | LangGraph | | LLM | OpenAI GPT-4o | | Web search | Tavily | | MCP server | FastMCP (Python SDK) | | Web UI | Streamlit | | PDF export | ReportLab | | Dependency management | uv |

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: sid12super
• Source: sid12super/MCP-Deep-Researcher
• License: MIT
• Homepage: https://sid12super-mcp-deep-researcher.streamlit.app/

Install and usage instructions live in the source repository linked above.