Agent Memory

Persistent semantic memory for AI agents with intelligent decision-making.

🚀 Created by: TheProdSDE

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The problem

Most AI memory systems retrieve and inject past context into every prompt. This leads to wasted tokens, inconsistent responses, and agents that blindly replay stale or wrong answers.

Agent Memory adds a decision layer:

flowchart TD
    A[User Query] --> B[Resolve Memory]
    B --> C[Decision Engine]
    C -->|High confidence match| D[🔄 Replay — return stored answer]
    C -->|Moderate match| E[📋 Restore — inject as context]
    C -->|Needs validation| F[✅ Verify — validate before reuse]
    C -->|No match| G[❌ None — answer from scratch]

    style D fill:#0d47a1,color:#fff
    style E fill:#e65100,color:#fff
    style F fill:#1b5e20,color:#fff
    style G fill:#b71c1c,color:#fff

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Every resolve() returns an explicit action with a scored, explainable rationale — not just a retrieved chunk. Adversarial eval: 34/36 (94%) on trap queries — the 2 misses return VERIFY (cautious), never a wrong REPLAY — see benchmarks.

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Context rot — what this solves (and what it can't)

Context rot is the measured degradation of LLM accuracy as the context window fills — long before the token limit. Stale chunks, irrelevant retrievals, and unbounded conversation history don't just waste tokens; they actively degrade answers ("lost in the middle", instruction drift, distractor sensitivity).

Context rot has two causes. Agent Memory addresses the first; nothing outside the model itself can address the second.

1. What goes into the context — controllable, and this SDK's job:

Rot source	Mechanism in Agent Memory
Irrelevant memory injected into every prompt	Decision layer — NONE refuses to inject when nothing truly matches (34/36 on adversarial trap queries; the 2 misses fail safe to VERIFY)
Unbounded in-session history	PagedMemory — fixed in-context buffer; old turns page out to recall storage and return per-query (MemGPT-style tiers)
Instruction drift in long coding sessions	RESTORE re-injects the relevant convention fresh, near the end of context, exactly when a query needs it
Stale facts silently reused	VERIFY + custom verifier callbacks + TTL expiry + half-life temporal decay
Reminders that never adapt	mark_correct() / mark_wrong() — confidence learning promotes memories that keep helping, demotes corrected ones
Knowledge lost when the session ends	from_conversation() distills durable facts from conversation turns into the store

2. How the model attends over tokens already in its context — not controllable from outside. Attention degradation over long context is a property of the model. No memory layer changes that. What Agent Memory does is keep the context small and relevant enough that the model rarely enters the degraded regime in the first place.

The honest claim: Agent Memory prevents context pollution — the dominant controllable cause of context rot in agentic systems. It doesn't change model attention behavior, and it only helps if your agent routes context through resolve() / PagedMemory instead of concatenating history by hand.

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How it compares

Today you need three tools wired together to get what resolve() does in one call: a semantic cache (GPTCache) for replay, a memory layer (Mem0 / Zep) for context, and custom staleness logic for verification. No existing tool decides — at read time — whether and how a memory should be used.

Cells about other projects are capability checks against their own source or docs (mem0 checked on 2026-09-27), not measured behaviour; ❔ means we have not tested it rather than that it is absent. Corrections welcome — see docs/comparison.md for sourcing and the benchmark RFC for the review process.

Capability	Mem0	Zep / Graphiti	Letta (MemGPT)	GPTCache	Agent Memory
Read-time decision (replay / inject / verify / skip)	❌ always injects	❌ always injects	⚠️ LLM self-manages	⚠️ replay only	✅ REPLAY / RESTORE / VERIFY / NONE
Explainable per-decision scores	❌	❌	❌	❌	✅ decision.explain()
Semantic answer cache (skip the LLM call)	❌	❌	❌	✅	✅
Staleness protection at read time	⚠️ write-side updates + expiration_date	✅ temporal graph	❌	⚠️ eviction only	✅ VERIFY + TTL + confidence decay
Adversarial trap-query eval published	❔ none found	❔ none found	❔ none found	❔ none found	✅ 34/36 (94%)
LLM / API calls per memory op	1+	1+	1+	0	0
Local after model assets are installed/cached, zero API keys	⚠️ self-hostable; needs an LLM for extraction	⚠️ needs server + LLM	⚠️ LLM per op	✅	✅ SQLite + local ONNX
Paged context tiers (MemGPT-style)	❌	❌	✅	❌	✅ memory.paged()

Because hosted or model-backed configurations can add an LLM or embedding API round-trip per memory operation, their latency includes provider, model, and network costs. Exact latency depends on each project's configuration; this repository does not publish a universal 100ms–2s floor. Agent Memory resolves in-process in SQLite-only mode; measured latency depends on corpus shape and cache state (see performance and stress-testing details).

On retrieval, we publish a cleaned-release retrieval-proxy measurement below. On end-to-end accuracy (LLM answering + judge, where Mem0 and Zep publish), we don't quote numbers we haven't measured yet — that stage is next on the roadmap. → Full feature matrix and trade-offs (including where they're better): docs/comparison.md

Benchmarked on LongMemEval (ICLR 2025)

LongMemEval is a benchmark for conversational-history retrieval. These results measure Agent Memory's RESTORE/retrieval tier, not REPLAY, VERIFY, TTL, or end-to-end answer correctness. Each question runs against a separate SQLite store containing that question's haystack; aggregate ingestion totals are not the size of one queried store. All ingestion uses zero LLM calls and $0 in API charges:

• LongMemEval_S (500 independent ~48-session haystacks; 124K turn-pair entries across all runs): 98.1% session Recall@5 with local ONNX embeddings, 96.0% lexical-only, 10.04ms lexical / 19.56ms semantic p50 retrieval. The report includes p90/p95/p99 and run-resource measurements.

• LongMemEval_M (500 independent ~500-session haystacks; ~2,500 turn-pair entries per queried store): 87.0% session Recall@5 with lexical retrieval, 12.05ms p50. This uses the official cleaned re-release and turn-pair indexing; it is not directly comparable with the paper's original-release session-index baselines.

Full methodology, per-type tables, scope notes (what this benchmark does and doesn't test), and negative results are in the benchmark report. Reproduce the semantic _S result with uv run python benchmarks/longmemeval/run_retrieval.py --semantic.

Real software, not a prototype

Every claim below is reproducible from this repo:

• 34/36 (94%) on adversarial decision-quality eval, and the 2 misses fail safe (VERIFY, never wrong REPLAY) — agent-memory eval (methodology)
• LongMemEval retrieval proxy: 98.1% Recall@5 (_S, semantic) · 87.0% (_M, lexical) — 500 independent haystacks; not an end-to-end or paper-baseline head-to-head, full report
• Reproducible stress harness for synthetically seeded workloads up to 1,000,000 entries; archive the JSON output before publishing a performance claim (methodology)
• Stress-test benchmark charts: latency percentiles, seed throughput, resource use, action mix, and cache/decision rates for lexical FTS5 runs at 10K, 100K, and 1M entries, with workload and archived result JSON documented in stress-testing
• 412 collected tests across 25 test modules — decision quality, concurrency, all 4 backends, MCP server, adapters — run in CI on every push
• Published on PyPI and the official MCP Registry
• Ships with a REST API, Streamlit dashboard, CLI, LangChain/LlamaIndex adapters, and async counterparts for memory read/write and decision operations

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When to use it — real use cases

Use case	Without memory	With Agent Memory	Saving
Support bot handling 10k identical FAQ queries/day	Every query costs 1 LLM call	If roughly 75% of requests match reusable memories, those matches can REPLAY without an LLM call	Potentially lower LLM cost; measure your workload
Coding agent that re-derives project conventions each session	Wastes 2–5 LLM calls per session to "remember" conventions	Conventions stored once are REPLAYED/RESTORED from the first query of every later session	No re-derivation overhead
Research agent building knowledge over multiple sessions	Each session starts cold; re-reads the same sources	Facts and summaries are RESTORED as context	Persistent cross-session knowledge
Customer onboarding bot answering the same steps repeatedly	Always generates a response	High-confidence workflows are REPLAYED verbatim	Consistent identical answers
Tool-output caching for expensive API calls	Calls the external API every time	Results stored with TTL; REPLAY within TTL, re-call after	Reduced external API cost
Policy-compliance agent that must verify facts before replaying	Silent hallucination risk on stale data	requires_verification=True routes relevant matches to VERIFY; low-scoring matches return NONE	Auditability + safety

Where Agent Memory saves real money

A GPT-4o call costs ~$0.005. A support agent handling 50,000 queries/day with 70% repeat rate:

• Without memory: 50,000 × $0.005 = $250/day
• With Agent Memory: 15,000 LLM calls + cache misses = $75/day
• Saving: ~ $175/day (~$64k/year)
• Savings depend on your repeat rate and how similar incoming queries are to previously stored ones — measure in your own pipeline.

REPLAY avoids an LLM call when policy permits it. The latency and cost difference depends on the local workload, provider, model, and network; measure both paths in your own pipeline.

Is it right for your use case?

Good fit:

• Agent answers the same or similar questions across sessions
• You have fact-sensitive answers that can go stale (prices, limits, policies)
• Multiple agents or services share a knowledge base
• You need audit trails — knowing which memory answered and why

Not the right tool:

• Document RAG over a corpus of files → use a vector database for that
• Replacing your application's source-of-truth database
• Agents that never repeat similar queries

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Features at a glance

Feature	What it does
Decision engine	Every resolve() returns REPLAY / RESTORE / VERIFY / NONE — never silent injection
Explainability	decision.explain() shows per-component scores: semantic, recency, confidence, usage
Hybrid retrieval	BM25 FTS5 + optional vector KNN + RRF fusion — fast and accurate
4 backends	SQLite (default, zero-setup) · ChromaDB · Redis · PostgreSQL
Framework adapters	Drop-in BaseMemory for LangChain and LlamaIndex
MCP server	Works with Cursor, Claude Code, VS Code via Model Context Protocol
REST API	FastAPI server with 9 endpoints + Swagger UI
Dashboard	Streamlit UI — stats, memory browser, live resolve sandbox
Multi-agent	SHARED / NAMESPACED / ISOLATED memory across multiple agents
Confidence learning	Event-driven confidence updates + half-life temporal decay
Memory graph	Relationship edges, path-finding, clusters, PageRank importance
Paged context	MemGPT-style tiers: in-context buffer → recall → archival; bounded working set per query
Conversation distillation	from_conversation() auto-extracts facts, preferences, and entities from turns
Async API	aremember, aresolve, alist, … — memory read/write and decision operations have async counterparts
TTL & states	Automatic expiry, archiving, near-duplicate consolidation

→ Full feature reference: docs/features.md

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Performance

Latency, CPU, and memory use depend on the corpus, query distribution, cache state, embedding mode, machine, and operating system. The bundled harness uses a repeatable synthetic workload; it does not establish a production SLA.

The current lexical FTS5 benchmark results and charts are archived with their source JSON in the stress-test methodology. See that document for commands, workload scope, and guidance on interpreting results.

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When to use it

Use Agent Memory when:

• You want an agent to remember past interactions without injecting all of them into every prompt
• You need explicit control over when memory is used (replay exact answers vs inject as context vs verify first)
• You have different memory trust levels (user preferences vs potentially-stale facts vs tool outputs)
• Multiple processes, services, or agents share the same memory store
• You need audit trails — every replay is traceable to a specific stored entry with a score breakdown

Don't use it for:

• Document RAG (search over a corpus of files) — use a vector database for that; Agent Memory stores query→answer experiences
• A replacement for your database — it stores transient agent knowledge, not your application's source-of-truth data

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Quick Start

pip install agent-memory-sdk

from agent_memory import Memory, MemoryAction

memory = Memory(persist_dir=".agent_memory")

# Store once after a good answer
memory.remember(
    "How do I reset my password?",
    "Go to Settings → Security → Reset Password.",
    type="conversation", tags=["auth"],
)

# Decide before every LLM call
decision = memory.resolve("How do I reset my password?")

if decision.action == MemoryAction.REPLAY:
    return decision.response          # exact match — no LLM call needed

if decision.action == MemoryAction.RESTORE:
    context = memory.format_restore_context(decision)
    return call_llm(query, system_extra=context)

# VERIFY or NONE — validate or answer fresh

→ Full integration pattern and API reference: docs/usage.md

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Local Setup

Option 1 — SQLite (zero dependencies, recommended to start)

pip install agent-memory-sdk

# Store something
agent-memory remember "How do I reset my password?" \
  "Go to Settings → Security → Reset Password." \
  --type conversation --tags auth,faq

# Ask the exact question back → REPLAY (no LLM call needed)
agent-memory resolve "How do I reset my password?"
# ✅ REPLAY   confidence: 0.88
# response: Go to Settings → Security → Reset Password.

# Ask a paraphrase → RESTORE (inject as context, don't answer verbatim)
agent-memory resolve "I forgot my password"
# 📋 RESTORE  confidence: 0.77
# [1] score=0.77  How do I reset my password? → Go to Settings → …

# See what's stored
agent-memory stats

Option 2 — Redis or Postgres backend

# Spin up the services
docker compose -f docker-compose.dev.yml up -d

# Install the backend extra
pip install "agent-memory-sdk[redis]"      # or [postgres]

# Use it
agent-memory --backend redis remember "API limit" "1000 req/min" --type fact
agent-memory --backend redis resolve "What is the rate limit?"

Option 3 — Streamlit dashboard (visual exploration)

pip install "agent-memory-sdk[dashboard]"

# Seed demo data (optional)
python scripts/seed_demo.py --data-dir .agent_memory

# Open the dashboard
AGENT_MEMORY_DIR=.agent_memory agent-memory-dashboard
# → http://localhost:8501

Option 4 — Development / from source

git clone https://github.com/TheProdSDE/agent-memory-sdk.git
cd agent-memory-sdk
python -m venv .venv && source .venv/bin/activate
pip install -e ".[dev]"
make test          # run all tests
make check         # lint + type check

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Dashboard

An interactive Streamlit dashboard for exploring memories, testing the resolve sandbox, and monitoring stats.

Stats — KPIs + charts	Memories — searchable table

Resolve → REPLAY	Resolve → VERIFY

pip install "agent-memory-sdk[dashboard]"
AGENT_MEMORY_DIR=.agent_memory agent-memory-dashboard   # → http://localhost:8501

# Seed demo data (optional — run only when you want it)
python scripts/seed_demo.py --data-dir .agent_memory

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MCP Server

Agent Memory is published on the MCP Registry — install it in any MCP-compatible client with zero manual setup.

Add to your MCP client

Cursor — add to .cursor/mcp.json in your project, or ~/.cursor/mcp.json globally:

{
  "mcpServers": {
    "agent-memory": {
      "command": "uvx",
      "args": ["agent-memory-sdk"]
    }
  }
}

Claude Desktop — add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "agent-memory": {
      "command": "uvx",
      "args": ["agent-memory-sdk"]
    }
  }
}

Claude Code — add to .claude/settings.json in your project:

{
  "mcpServers": {
    "agent-memory": {
      "command": "uvx",
      "args": ["agent-memory-sdk"]
    }
  }
}

uvx installs the package on first run — no pip install needed.

Custom storage location

{
  "mcpServers": {
    "agent-memory": {
      "command": "uvx",
      "args": ["agent-memory-sdk"],
      "env": {
        "AGENT_MEMORY_DIR": "/path/to/your/memory",
        "AGENT_MEMORY_COLLECTION": "my_project"
      }
    }
  }
}

Variable	Default	Description
AGENT_MEMORY_DIR	~/.agent_memory	Directory for the persistent SQLite store
AGENT_MEMORY_COLLECTION	agent_memories	Collection name (one DB per collection)

Tools exposed

Tool	What it does
resolve_memory	Retrieve memory and get an explicit decision: replay / restore / verify / none — with confidence score and reasoning
remember_memory	Store a query/response pair with optional tags, type, scope, confidence, TTL
list_memories	Paginated list of stored memories with scope and archive filters
get_memory_by_id	Fetch a single memory entry by ID
forget_memory	Permanently delete a memory
archive_memory	Archive a memory (excluded from retrieval, not deleted)
consolidate_memories	Merge near-duplicate memories into summary entries

→ Full MCP setup guide and Docker config: docs/mcp.md

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Integrations

agent-memory-sdk is the core — every integration delegates to Memory.

Integration	Install extra	Example
Core SDK (SQLite)	(none)	basic_usage.py
LangChain BaseMemory	[langchain]	langchain_integration.py
LlamaIndex BaseMemory	[llamaindex]	llamaindex_integration.py
Redis backend	[redis]	redis_backend.py
PostgreSQL backend	[postgres]	postgres_backend.py
Multi-agent isolation	(none)	multi_agent.py
FastAPI REST server	[api]	rest_api.py
Confidence + Graph	(none)	confidence_and_graph.py
Benchmark harness	(none)	benchmark_harness.py

→ Setup instructions and code snippets for each: examples/README.md

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Tech Stack

Component	Technology
Language	Python 3.10+
Storage	SQLite · ChromaDB · Redis · PostgreSQL
Retrieval	BM25 FTS5 + Vector KNN + RRF fusion
Interfaces	MCP · FastAPI · Streamlit · CLI
Adapters	LangChain BaseMemory · LlamaIndex BaseMemory
Search DSA	Bloom filter (NONE fast-path) · Dynamic IDF stop words · RRF fusion
Testing	pytest (412 collected tests) · ruff · mypy
CI/CD	GitHub Actions — test matrix 3.10–3.13 → release gate → PyPI

No API keys required — everything runs locally.

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Documentation

Doc	Contents
docs/usage.md	Integration pattern, API reference, MemoryEntry / MemoryDecision fields
docs/features.md	Decision actions, hybrid retrieval, types, scopes, TTL, graph, multi-agent
docs/mcp.md	MCP server setup for Cursor, Claude Code, VS Code; Docker config
docs/cli.md	CLI commands, REST API server, dashboard launch, eval dataset format
docs/roadmap.md	All shipped features, what's next, GitHub Project board
docs/release.md	CI-automated release process, versioning, rollback
docs/architecture.md	Retrieval pipeline, scoring policy, system design
docs/comparison.md	Feature matrix vs Redis, mem0, Zep, LangMem, LlamaIndex, MemGPT
docs/stress-testing.md	10K / 100K / 1M latency benchmarks with methodology
docs/benchmarks.md	Eval results and reproduce commands
docs/why-decision-layer.md	The failure mode this project exists to fix
examples/README.md	Index of all runnable examples
CONTRIBUTING.md	Dev setup, test commands, PR checklist

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Status & Roadmap

All planned features through v0.5.0 are shipped. Track what's next on the GitHub Project →

→ docs/roadmap.md

Release

Tag-triggered, fully CI-gated: git tag v0.x.y && git push origin v0.x.y

→ docs/release.md

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Contributing

See CONTRIBUTING.md for dev setup, test commands, and the PR checklist.

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Citation

If you use Agent Memory SDK or its benchmark suite in your research, articles, or projects, please cite this repository using GitHub's Cite this repository button.

For reproducible benchmark comparisons, reference the exact SDK version, benchmark dataset version, configuration, and Git commit.

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License

Apache-2.0 — see LICENSE.

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Support

• Issues: GitHub Issues
• Discussions: GitHub Discussions
• Email: theprodsde@gmail.com

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Agent Memory helps agents decide: Replay → Restore → Verify → Ignore

Built with ❤️ by TheProdSDE

mcp-name: io.github.theprodsde/agent-memory