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  1. Home
  2. 🧠 Knowledge & Memory
  3. Pensyve
Pensyve logo
Health: ActiveRecent health check succeeded.Last checked 9/7/2026, 9:22:25 PM

Pensyve

User RatingsBe the first to rate and review this MCP server! Enrichment pendingWe haven’t run our AI enrichment pass on this listing yet, so the overview, use cases, and FAQ below may be sparse or missing. We work through the catalog over time β€” check back soon.
View Repository78 GitHub StarsTotal stargazers on GitHub for the source repository (78 stars).Visit Website

Universal memory runtime for AI agents β€” episodic, semantic, and procedural memory.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent β€” or use 1-click editor setup below.

Add to CursorAdd to VS Code
Not yet automatically verified

We haven't yet run this listing's install command through our automated sandbox check. This isn't a red flag β€” we're steadily working through the catalog.

Manual Client & Custom JSON ConfigExpand JSON β–Ύ

Client Config & Setup

Choose your client or environment
Target File:~/Library/Application Support/Claude/claude_desktop_config.json
claude_desktop_config.json
{
  "mcpServers": {
    "pensyve": {
      "command": "uvx",
      "args": [
        "pensyve"
      ]
    }
  }
}

πŸ’‘ Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Install Directory Badge Claim listing Alternatives🧠 More in Knowledge & Memory

Documentation Overview

Pensyve Banner Logo

Pensyve

CI License: Apache 2.0 Python 3.10+ Rust 1.88+

Universal memory runtime for AI agents. Framework-agnostic, protocol-native, offline-first.

Without memory

Code
User: "I prefer dark mode and use vim keybindings"
Agent: "Got it!"

[next session]

User: "Update my editor settings"
Agent: "What settings would you like to change?"
User: "I ALREADY TOLD YOU"

With Pensyve

python
# Session 1 β€” agent stores the preference
p.remember(entity=user, fact="Prefers dark mode and vim keybindings", confidence=0.95)

# Session 2 β€” agent recalls it automatically
memories = p.recall("editor settings", entity=user)
# β†’ [Memory: "Prefers dark mode and vim keybindings" (score: 0.94)]

Your agent stops being amnesiac. Decisions, patterns, and outcomes persist across sessions β€” and the right context surfaces when it's needed.

Why Pensyve

What you needHow Pensyve solves it
Agent forgets everything between sessionsThree memory types β€” episodic (what happened), semantic (what is known), procedural (what works)
Agent can't find the right memory8-signal fusion retrieval β€” vector similarity + BM25 + graph + intent + recency + frequency + confidence + type boost
Agent repeats failed approachesProcedural memory — Bayesian tracking on action→outcome pairs surfaces what actually works
Memory store grows unboundedFSRS forgetting curve β€” memories you use get stronger, unused ones fade naturally. Consolidation promotes repeated facts.
Need cloud signup to get startedOffline-first β€” SQLite + ONNX embeddings. Works on your laptop right now. No API keys needed.
Need to scale to productionPostgres backend β€” feature-gated pgvector for multi-node deployments. Managed service at pensyve.com.
Only works with one frameworkFramework-agnostic β€” Python, TypeScript, Go, MCP, REST, CLI. Drop-in adapters for LangChain, CrewAI, AutoGen.

Install

Terminal
pip install pensyve          # Python (PyPI)
npm install @pensyve/sdk     # TypeScript (npm)
go get github.com/major7apps/pensyve/pensyve-go/v3@latest  # Go

Or use the MCP server directly with Antigravity CLI, Codex, Claude Code, Cursor, or any MCP client β€” see MCP Setup.

Quick Start

Terminal
pip install pensyve

Episode: your agent remembers a conversation

server.ts
import pensyve

p = pensyve.Pensyve()
user = p.entity("user", kind="user")

# Record a conversation β€” Pensyve captures it as episodic memory
with p.episode(user) as ep:
    ep.message("user", "I prefer dark mode and use vim keybindings")
    ep.message("agent", "Got it β€” I'll remember your editor preferences")
    ep.outcome("success")

# Later (even in a new session), the agent recalls what happened
results = p.recall("editor preferences", entity=user)
for r in results:
    print(f"[{r.score:.2f}] {r.content}")

Recall grouped: feed an LLM reader without rebuilding session blocks

When the consumer of recalled memories is another LLM (the dominant "memory for an AI agent" pattern), recall_grouped() returns memories already clustered by source session and ordered chronologically β€” ready to format as session blocks in a reader prompt.

server.ts
import pensyve

p = pensyve.Pensyve()
groups = p.recall_grouped("How many projects have I led this year?", limit=50)

# Each group is one conversation session β€” feed it to a reader directly.
for i, g in enumerate(groups, start=1):
    print(f"### Session {i} ({g.session_time}):")
    for m in g.memories:
        print(f"  {m.content}")

No more manual OrderedDict clustering, no more reordering by date string, no more boilerplate every consumer has to reinvent.

Remember: store an explicit fact

python
p.remember(entity=user, fact="Prefers Python over JavaScript", confidence=0.9)

Procedural: the agent learns what works

python
# After a debugging session that succeeded:
ep.outcome("success")

# Pensyve tracks action→outcome reliability with Bayesian updates.
# Next time a similar issue comes up, recall surfaces the approach that worked.

Consolidate: memories stay clean

python
p.consolidate()
# Promotes repeated episodic facts to semantic knowledge
# Decays memories you never access via FSRS forgetting curve

Building from source

Prerequisites and build steps
  • Rust 1.88+, Python 3.10+ with uv
  • Optional: Bun (TypeScript SDK), Go 1.21+ (Go SDK)
server.ts
git clone https://github.com/major7apps/pensyve.git && cd pensyve
uv sync --extra dev
uv run maturin develop --release -m pensyve-python/Cargo.toml
uv run python -c "import pensyve; print(pensyve.__version__)"

Interfaces

Pensyve exposes its core engine through multiple interfaces β€” use whichever fits your stack.

Python SDK

Direct in-process access via PyO3. Zero network overhead.

server.ts
import pensyve

p = pensyve.Pensyve(namespace="my-agent")
entity = p.entity("user", kind="user")

# Remember a fact
p.remember(entity=entity, fact="User prefers Python", confidence=0.95)

# Recall memories (flat list)
results = p.recall("programming language", entity=entity)

# Recall memories clustered by source session β€” the canonical entry point
# for "memory as input to an LLM reader" workflows.
groups = p.recall_grouped("programming language", limit=50)

# Record an episode
with p.episode(entity) as ep:
    ep.message("user", "Can you fix the login bug?")
    ep.message("agent", "Fixed β€” the session token was expiring early")
    ep.outcome("success")

# Consolidate (promote repeated facts, decay unused memories)
p.consolidate()

MCP Server

Works with Antigravity CLI, Claude Code, Cursor, and any MCP-compatible client.

bash
cargo build --release --bin pensyve-mcp
config.json
{
  "mcpServers": {
    "pensyve": {
      "command": "./target/release/pensyve-mcp",
      "env": { "PENSYVE_PATH": "~/.pensyve/default" }
    }
  }
}

Tools exposed: recall, remember, episode_start, episode_end, forget, inspect, status, account

Claude Code Plugin

Full cognitive memory layer for Claude Code with 7 commands, 4 skills, 2 agents, and 6 lifecycle hooks.

Install from the marketplace:

Code
/plugin marketplace add major7apps/pensyve
/plugin install pensyve@major7apps-pensyve
/reload-plugins

The plugin does not bundle an MCP server config β€” auth method and backend are user choices. Add an mcpServers.pensyve entry to your ~/.claude/settings.json (user-level) or .claude/settings.json (project-level). Pick one:

Pensyve Cloud β€” API key (recommended):

server.ts
export PENSYVE_API_KEY="psy_your_key_here"
config.json
{
  "mcpServers": {
    "pensyve": {
      "type": "http",
      "url": "https://mcp.pensyve.com/mcp",
      "headers": {
        "Authorization": "Bearer ${PENSYVE_API_KEY}"
      }
    }
  }
}

Pensyve Cloud β€” OAuth (browser sign-in):

config.json
{
  "mcpServers": {
    "pensyve": {
      "type": "http",
      "url": "https://mcp.pensyve.com/mcp"
    }
  }
}

Pensyve Local (self-hosted, no API key):

Build the MCP binary first (see Install), then:

config.json
{
  "mcpServers": {
    "pensyve": {
      "command": "pensyve-mcp",
      "args": ["--stdio"]
    }
  }
}

Note: Use headers with Authorization: Bearer for remote MCP (HTTP transport). Use the top-level env block (Claude Code MCP schema) for local stdio servers that read environment variables at startup.

Code
Plugin contents:
β”œβ”€β”€ 7 slash commands   /remember, /recall, /forget, /inspect, /consolidate, /memory-status, /using-pensyve
β”œβ”€β”€ 4 skills           session-memory, memory-informed-refactor, context-loader, memory-review
β”œβ”€β”€ 2 agents           memory-curator (background), context-researcher (on-demand)
└── 6 hooks            SessionStart, Stop, PreCompact, UserPromptSubmit, PostToolUse (Write/Edit, Bash)

See integrations/claude-code/README.md for full documentation.

Codex Plugin

First-class working memory for OpenAI Codex with a plugin manifest, bundled MCP server config, hooks, skills, /pensyve, and $pensyve skill invocation.

Add this repo as a Codex plugin marketplace, then install Pensyve:

bash
codex plugin marketplace add major7apps/pensyve
codex plugin add pensyve@pensyve-codex

For local development from a checkout, use codex plugin marketplace add /path/to/pensyve/integrations/codex-plugin instead.

Set your API key for the bundled MCP server:

server.ts
export PENSYVE_API_KEY="psy_your_key_here"

Read the full README β†’View source on GitHub β†’

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Reviews

No reviews yet β€” be the first to share how this listing worked for you.

Frequently Asked Questions about Pensyve

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "pensyve": { "command": "npx", "args": ["-y", "Pensyve"] } }

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Technical Specs & Signals

Category🧠Knowledge & Memory
More technical detailsExpand β–Ύ
TransportSTDIO
RuntimePython
Last updatedSep 7, 2026
Views0
Unique ViewsTotal visits recorded for this listing page on AllMCPs.
Installs0
Installs & Copy ActionsTotal times users copied install commands or configuration snippets for this server.
GitHub stars78
GitHub Star CountTotal stargazers on GitHub representing community popularity (78 stars).
41Quality signal: Fair Β· 41/100How this signal is calculated β–Ύ
Server availabilityNot measured

Not scored for repo-hosted servers β€” we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership10/20
Documentation & tools16/30
Adoption & activity5/15
Community engagement0/10

A guidance signal from public completeness & health data β€” not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

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