A catalog of ChatGPT & Codex plugins, sorted by people.
Best MCP servers & Codex plugins for memory
30 plugins in our catalog say they help with memory. Here are the top 12, editor's picks first, then by GitHub stars. Most of them sit in Memory & Context and Agent Workflows.
How to choose
- Match the host first: Codex and Claude Code install commands differ, and the install line below shows which one each project targets.
- Check where it runs. Hosted MCP endpoints are quicker to set up but send your requests to someone else's server.
- Prefer a recent push and a real license (MIT or Apache-2.0) for anything you'll use at work.
- Stars tell you how many people looked, not whether it works. Read the code before you install.
The list
1. Citadel
Operating layer for Claude Code and Codex: persistent project memory, intent routing and orchestration, installable as a Codex plugin.
★ 931 · MIT · pushed 2026-11-12 (this week) · plugin · by SethGammon · alternatives
codex plugin marketplace add SethGammon/Citadel --ref v1.4.5
2. AgentOps
DevOps layer for coding agents with flow, feedback, and memory that compounds between sessions.
★ 454 · Apache-2.0 · pushed 2026-11-15 (this week) · plugin · by boshu2 · alternatives
claude plugin marketplace add boshu2/agentops
3. Loom
Self-hosted shared long-term memory and code index (definitions, callers, change impact) for Codex, stored in ClickHouse, with lifecycle hooks that capture each session and MCP tools that save and recall decisions across sessions and teammates.
★ 85 · Apache-2.0 · pushed 2026-11-15 (this week) · MCP server, plugin · by ClickHouse · alternatives
claude plugin marketplace add ClickHouse/loom
4. Honcho
Persistent cross-session memory for Codex powered by Honcho — lifecycle hooks capture each session and inject relevant context back at session start, so Codex remembers your preferences, projects, and decisions across restarts.
★ 66 · MIT · pushed 2026-09-01 (75 days ago) · plugin · by plastic-labs · alternatives
5. memi
Interface understanding and design-system memory for Codex, Claude Code, Cursor, and MCP agents with UI audits, Tailwind token extraction, shadcn registry workflows, and a bundled Codex plugin.
★ 51 · MIT · pushed 2026-11-13 (this week) · MCP server, skills · by sarveshsea
npx skills add memi-design/memi --skill audit-frontend-design
6. Waggle
Persistent graph-backed conversational memory for Codex that recalls project decisions, constraints, preferences, and outcomes across sessions.
★ 45 · Apache-2.0 · pushed 2026-10-30 (last 30 days) · plugin · by Abhigyan-Shekhar · alternatives
7. Docflow
Lightweight documentation memory for AI coding agents that scaffolds a 7-category docs tree, runs readiness checks, validates docs before finishing, and keeps a monthly changelog across Claude Code and Codex.
★ 44 · MIT · pushed 2026-08-15 (92 days ago) · plugin · by MedAdemBHA · alternatives
/plugin marketplace add https://github.com/MedAdemBHA/docflow
8. LLMSlim
Long-term memory for Codex with no LLM in the loop: a local MCP server stores messages word for word in SQLite and recalls the ones that answer a question within a token budget.
★ 25 · MIT · pushed 2026-11-13 (this week) · MCP server, plugin · by Thanatos9404 · alternatives
/plugin marketplace add Thanatos9404/llmslim
9. memtomem
Markdown-first long-term memory for Codex that searches, recalls, saves and indexes project notes, and resumes work from a handoff another session or agent wrote.
★ 24 · Apache-2.0 · pushed 2026-11-15 (this week) · MCP server · by memtomem · alternatives
claude mcp add memtomem -s user -e MEMTOMEM_EXTRA_TOOLS=mem_update_coverage -- uvx --isolated --from "memtomem[all]==0.7.10" memtomem-server
10. ejentum-mcp
MCP server exposing reasoning, code, anti-deception, and memory harness tools for Codex.
★ 16 · MIT · pushed 2026-06-11 (157 days ago) · MCP server · by ejentum · alternatives
claude mcp add ejentum -e EJENTUM_API_KEY=ej_... -- npx -y ejentum-mcp
11. Kernel
Hook-enforced guardrails for Codex and Claude Code with blocked destructive commands, one-time human tokens for irreversible operations, context-blind verification agents, and SQLite agent memory recalled at session start.
★ 15 · MIT · pushed 2026-11-15 (this week) · plugin · by ariaxhan · alternatives
claude plugin marketplace add ariaxhan/kernel-claude
12. Claude Code Harness
Harness blueprint skill for turning vague agent ideas into concrete designs for request assembly, control loops, memory, permissions, recovery, and extension planes.
★ 13 · MIT · pushed 2026-04-05 (224 days ago) · skills · by dadwadw233 · alternatives
Head-to-head
Loom vs Honcho · Citadel vs AgentOps · ejentum-mcp vs Claude Code Harness · Honcho vs Waggle · LLMSlim vs memtomem
Matched by keywords in each project's own name and description. The topic comes from what people actually type into Google and Bing search boxes.
All comparisons and use cases →
Data from GitHub and each project's README, checked 2026-11-15. We haven't installed or audited these, and stars measure attention, not quality. Paid placements never change this page. Spot a mistake? hello@pickaplugin.com
New MCP servers & plugins, once a week
One short email a week: the MCP servers and plugins that joined the catalog, and the ones gaining stars fastest. Free. Confirm by email, unsubscribe in one click. Past issues.
