Massive Context MCP

Handle massive contexts (10M+ tokens) with chunking, sub-queries, and free local inference via Ollama.

flowchart TD
    A[Claude Code] --> B[RLM MCP Server]
    B --> C{rlm_ollama_status}
    C -->|cached 60s| D{provider = auto}

    D -->|Ollama running| E[🦙 Ollama<br/>gemma3:12b]
    D -->|Ollama unavailable| F[☁️ Claude SDK<br/>claude-haiku-4-5]

    E --> G[["💰 $0<br/>Free local inference"]]
    F --> H[["💰 ~$0.80/1M<br/>Cloud inference"]]

    style A fill:#ff922b,color:#fff
    style B fill:#339af0,color:#fff
    style E fill:#51cf66,color:#fff
    style F fill:#748ffc,color:#fff
    style G fill:#51cf66,color:#fff
    style H fill:#748ffc,color:#fff

Based on the Recursive Language Model pattern. Inspired by richardwhiteii/rlm.

Core Idea

Instead of feeding massive contexts directly into the LLM:

1. Load context as external variable (stays out of prompt)
2. Inspect structure programmatically
3. Chunk strategically (lines, chars, or paragraphs)
4. Sub-query recursively on chunks
5. Aggregate results for final synthesis

Quick Start

Installation

Option 1: PyPI (Recommended)

uvx massive-context-mcp
# or
pip install massive-context-mcp

With Optional Extras:

# With Code Firewall integration (security filter for rlm_exec)
pip install massive-context-mcp[firewall]

# With Claude Agent SDK (for programmatic Claude API access)
pip install massive-context-mcp[claude]

# With all extras
pip install massive-context-mcp[firewall,claude]

Option 2: Claude Desktop One-Click

Download the .mcpb from Releases and double-click to install.

Option 3: From Source

git clone https://github.com/egoughnour/massive-context-mcp.git
cd massive-context-mcp
uv sync

Wire to Claude Code / Claude Desktop

Add to ~/.claude/.mcp.json (Claude Code) or claude_desktop_config.json (Claude Desktop):

{
  "mcpServers": {
    "massive-context": {
      "command": "uvx",
      "args": ["massive-context-mcp"],
      "env": {
        "RLM_DATA_DIR": "~/.rlm-data",
        "OLLAMA_URL": "http://localhost:11434"
      }
    }
  }
}

Tools

Setup & Status Tools

Analysis Tools

Quick Analysis with rlm_auto_analyze

For most use cases, just use rlm_auto_analyze — it handles everything automatically:

rlm_auto_analyze(
    name="my_file",
    content=file_content,
    goal="find_bugs"  # or: summarize, extract_structure, security_audit, answer:<question>
)

What it does automatically:

1. Detects content type (Python, JSON, Markdown, logs, prose, code)
2. Selects optimal chunking strategy
3. Adapts the query for the content type
4. Runs parallel sub-queries
5. Returns aggregated results

Supported goals:

Programmatic Analysis with rlm_exec

For deterministic pattern matching and data extraction, use rlm_exec to run Python code directly against a loaded context. This is closer to the paper's REPL approach and provides full control over analysis logic.

Tool: rlm_exec

Purpose: Execute arbitrary Python code against a loaded context in a sandboxed subprocess.

Parameters:

• code (required): Python code to execute. Set the result variable to capture output.
• context_name (required): Name of a previously loaded context.
• timeout (optional, default 30): Maximum execution time in seconds.

Features:

• Context available as read-only context variable
• Pre-imported modules: re, json, collections
• Subprocess isolation (won't crash the server)
• Timeout enforcement
• Works on any system with Python (no Docker needed)

Example — Finding patterns in a loaded context:

# After loading a context
rlm_exec(
    code="""
import re
amounts = re.findall(r'\$[\d,]+', context)
result = {'count': len(amounts), 'sample': amounts[:5]}
""",
    context_name="bill"
)

Example Response:

{
  "result": {
    "count": 1247,
    "sample": ["$500", "$1,000", "$250,000", "$100,000", "$50"]
  },
  "stdout": "",
  "stderr": "",
  "return_code": 0,
  "timed_out": false
}

Example — Extracting structured data:

rlm_exec(
    code="""
import re
import json

# Find all email addresses
emails = re.findall(r'\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b', context)

# Count by domain
from collections import Counter
domains = [e.split('@')[1] for e in emails]
domain_counts = Counter(domains)

result = {
    'total_emails': len(emails),
    'unique_domains': len(domain_counts),
    'top_domains': domain_counts.most_common(5)
}
""",
    context_name="dataset",
    timeout=60
)

When to use rlm_exec vs rlm_sub_query:

Tip: For large contexts, combine both — use rlm_exec to filter/extract, then rlm_sub_query for semantic analysis of filtered results.

Code Firewall Integration (Optional)

For enhanced security, integrate code-firewall-mcp to filter dangerous code patterns before execution:

pip install massive-context-mcp[firewall]

When installed, rlm_exec can automatically check code against a blacklist of known dangerous patterns (e.g., os.system(), eval(), subprocess with shell=True). The firewall uses structural similarity matching — normalizing code to its skeleton and comparing against blacklisted patterns via embeddings.