Sulcus × Deep Agents

Thermodynamic memory middleware for LangChain Deep Agents. Replace flat AGENTS.md files with a real memory engine.

The Problem

Deep Agents' built-in memory is a Markdown file (AGENTS.md) that the LLM manually edits with edit_file. This means:

• No search — the entire file is loaded every time, regardless of relevance
• No decay — everything stays forever until the LLM decides to delete it
• No cross-agent sharing — sub-agents get isolated filesystems; their memories die when they terminate
• No cross-session persistence — sandbox restarts lose everything
• No prioritization — a three-month-old preference and a five-minute-old finding have equal weight

The Fix

sulcus-deepagents replaces this with the Sulcus thermodynamic engine:

• Semantic search — only relevant memories are injected, ranked by similarity + heat
• Automatic decay — episodic memories fade in hours; semantic knowledge persists for months
• Cross-agent sharing — sub-agents write to the same Sulcus graph; findings survive termination
• Persistent across sessions — memories live in the database, not the sandbox
• Heat propagation — recently recalled, frequently accessed memories rank higher

Install

pip install sulcus-deepagents

Quick Start

Middleware (automatic context injection)

from sulcus import Sulcus
from sulcus_deepagents import SulcusMemoryMiddleware
from deepagents import create_deep_agent

client = Sulcus(api_key="sk-...")

agent = create_deep_agent(
    middleware=[
        SulcusMemoryMiddleware(client=client)
    ]
)

Every model call now gets relevant memories injected into the system prompt automatically.

Tools (explicit memory operations)

from sulcus_deepagents import SulcusMemoryTools

memory_tools = SulcusMemoryTools(client=client)

agent = create_deep_agent(
    tools=memory_tools.tools()
)

The agent gets five memory tools:

Tool	Description
sulcus_store	Store a memory with type + importance classification
sulcus_search	Search by natural language, ranked by relevance + heat
sulcus_recall	Recall a memory by ID, boosting its heat
sulcus_pin	Pin/unpin to prevent/allow decay
sulcus_forget	Permanently delete a memory

Combined (recommended)

agent = create_deep_agent(
    middleware=[SulcusMemoryMiddleware(client=client)],
    tools=memory_tools.tools(),
)

The middleware handles passive context injection. The tools handle active memory management. Together, the agent gets automatic recall AND explicit control.

Backend (AGENTS.md interception)

from sulcus_deepagents import SulcusBackend

agent = create_deep_agent(
    backend=SulcusBackend(client=client)
)

Intercepts AGENTS.md reads/writes — read_file("AGENTS.md") returns a Sulcus-generated summary; write_file("AGENTS.md", content) parses and stores entries as individual memory nodes.

Memory Types

Type	Use For	Default Decay
episodic	Events, conversations, task findings	Fast (24h half-life)
semantic	Facts, knowledge, data	Slow (30d half-life)
preference	Settings, opinions, style	Slower (90d half-life)
procedural	Workflows, how-tos, patterns	Slowest (180d half-life)
moment	Significant interactions	Slow (custom)

Sub-Agent Memory Sharing

This is where Sulcus changes the game. In standard Deep Agents:

Main Agent → spawns Sub-Agent → sub-agent edits its AGENTS.md → sub-agent terminates → AGENTS.md is GONE

With Sulcus:

Main Agent → spawns Sub-Agent → sub-agent calls sulcus_store → sub-agent terminates → memory PERSISTS

Both agents share one Sulcus tenant. The sub-agent's findings are immediately searchable by the main agent and any future agents.

Configuration

SulcusMemoryMiddleware(
    client=client,
    search_limit=15,       # Max memories per turn
    token_budget=2000,     # Approximate tokens for memory context
    memory_types=None,     # Filter types (None = all)
    min_heat=0.0,          # Minimum heat threshold
)

Self-Hosted

client = Sulcus(
    api_key="your-key",
    server_url="http://localhost:4200",
)

Examples

• examples/basic_agent.py — Single agent with persistent memory
• examples/multi_agent.py — Main agent + research sub-agent with shared memory

Links

• Sulcus Documentation
• Deep Agents Documentation
• Sulcus Python SDK
• All Integrations