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PMB

local-first memory for AI coding agents over MCP

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How it works: - Storage uses one SQLite database file, plus a local LanceDB index of vectors. No need for a server, cloud services, or any API keys. - Retrieval is a hybrid approach using BM25 (rank-bm25) and vector-based search (sentence-transformers) combined with a co-occurrence graph of entities, using reciprocal rank fusion. The idea is to find the right memory, not the closest one. - It plugs into the agent's lifecycle via MCP: before the agent responds, relevant memories are added to its input; after each turn, decisions and new learnings are automatically recorded. No need to manually remember "remember this". - It maintains a dictionary for each project which builds itself based on your memories, which improves recall performance for the project-specific vocabulary. - It can run fully offline, pointing to a locally installed Ollama model and even the optional large language model features such as consolidation, de-duplication, and chatting about your memories stays on your machine. Embedding is done locally by default.

HN · launched Jun 22, 2026 · 7 upvotes (top 58%) · 0 views

Niche: ai agent memory infrastructure · 350 launches, 11 in the last 7 days ▼ -58% · Explore this niche →

Category and tags

  • Horizontal
  • Dev tools
  • Developer
  • AI-native
  • Hobby / open-source project

Visit website ↗ Source listing ↗

Could you build this?

Yes PMB combines standard open-source libraries (SQLite, LanceDB, rank-bm25, and sentence-transformers) into a Model Context Protocol (MCP) server, which AI assistants can generate rapidly.

Discussion

6 comments analyzed.

Competitors mentioned: Mem0, Zep

Concerns raised: Unclear retrieval advantages over Mem0/Zep beyond MCP injection, Whether project specialization justifies feature gap vs more developed hosted offerings

Feature requests: Hosted/managed memory API option (not just self-hosted), Direct integration with Claude Code, Cursor, Codex without custom code

Competitors

Other products that read as similar to this one : 582 launches clear the similarity bar, closest 8 shown.

Attention rank: #323 of 583 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 230 days after the earliest competitor.

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