ranbot-ai/mesh-memory

Mesh Memory

Mesh Memory is a self-hosted semantic memory service with a built-in MCP server. It stores documents (worklogs, decisions, notes, research) in PostgreSQL with pgvector and retrieves them by meaning, so a query like "what database did we pick?" surfaces a saved note that says "chose Redis for caching" even with zero keyword overlap. Embeddings are generated locally with multilingual-e5-base (768 dimensions); the core flow requires no external API keys.

Use this skill when an agent needs persistent memory across sessions: saving its own work, recalling prior decisions, or building a project knowledge base shared between multiple agents.

When to Use This Skill

• Saving a session worklog, decision, or research note so a later session can find it.
• Recalling past work by topic when you do not remember the exact words you used.
• Sharing a long-lived knowledge base across multiple agents, terminals, or teammates.
• Organizing context by role or project through workspaces (one workspace per role/project).
• Looking up structured tags (e.g. all type:decision entries from one project).

Prerequisites

• A running Mesh Memory instance reachable from the MCP server. Local Docker is the common path -- docker compose up -d in the upstream repo brings it up; see https://github.com/dklymentiev/mesh-memory for the full Quick Start.
• The MCP server (mcp_server.py) registered with your client (Claude Code, Cursor, Claude Desktop, or any other MCP-aware agent).
• MESH_API_URL pointing at the running instance (default: http://localhost:8000).

Setup

Register the MCP server in your client configuration:

{
  "mcpServers": {
    "mesh": {
      "command": "python3",
      "args": ["/path/to/mesh-memory/mcp_server.py"],
      "env": {
        "MESH_API_URL": "http://localhost:8000"
      }
    }
  }
}

When the server is reachable, the 13 tools listed below become available.

MCP Tools

| Tool | Purpose | |------|---------| | mesh_focus | Switch the active workspace (optionally prefetch recent docs). | | mesh_add | Save a document with optional tags. Auto-adds date:YYYY-MM-DD and source:. | | mesh_update | Update content, tags, or pinned status of an existing document. | | mesh_delete | Delete a document by GUID. | | mesh_get | Fetch a single document by GUID. | | mesh_search | Semantic search by query, optionally across multiple workspaces with weights. | | mesh_bytag | List documents that match one or more tags (AND logic). | | mesh_recent | List most recently created documents, optionally filtered by type: tag. | | mesh_projects | List per-project document counts (uses guid: tag as project marker). | | mesh_tags | List existing tags with counts; optional prefix filter. | | mesh_versions | Show the version chain of a document (similarity-linked revisions). | | mesh_stats | Memory statistics for the active workspace. | | mesh_schema | Show the tag schema (recognized prefixes and types). |

Workflows

Save a session worklog

After completing work, persist it for future sessions:

mesh_add(
  content="Investigated 502s on the checkout flow. Root cause: missing CORS header on the cart API. Fix shipped in commit abc123.",
  tags="type:worklog,topic:checkout,date:2026-05-23",
  workspace="developer"
)

date: and source: are added automatically when omitted. Type and topic tags are inferred from nearest neighbors after the embedding completes (5-10 seed documents required before inference kicks in).

Recall past work by meaning

Search across sessions for related context, even with different vocabulary:

mesh_search(query="checkout was failing for some users", limit=5, workspace="developer")

The query shares no keywords with the original note ("502s", "CORS"), but the embedding-based search surfaces it.

Switch role / context

For a multi-role agent, switch the active workspace at the start of a session:

mesh_focus(workspace="sysadmin", prefetch=true, limit=5)

Subsequent calls default to that workspace. Pin a role-prompt document at the top of each workspace so the agent re-orients on every prefetch.

Cross-workspace search with weights

To pull context from related domains without diluting the primary signal:

mesh_search(
  query="nginx rate limit recipe",
  workspaces={"sysadmin": 0.7, "security": 0.2, "developer": 0.1},
  limit=10
)

Results are merged across workspaces and re-scored by workspace weight.

Structured lookups by tag

When you need an exact filter rather than semantic similarity:

mesh_bytag(tags="type:decision,status:active,guid:my-project", limit=20)

Tag Conventions

Mesh accepts arbitrary tags. The recommended prefixes (used by auto-inference and surfaced by mesh_schema):

| Prefix | Meaning | |--------|---------| | type:worklog | Completed work; the most common type. | | type:note | Quick notes, observations. | | type:decision | Architecture