Prism Coder

Name: Prism Coder
Author: Dmitri Costenco

Local session memory, knowledge graph and Ollama-backed inference for coding agents

By Dmitri Costenco (individual) TypeScript Local · stdio Knowledge and memory AI and ML Developer tools

GitHub npm Website

48 popularity score ★ 156 ↓ 468/wk

Connect your client

Local (npm)

Add in one click

Add to Cursor Add to VS Code Add to LM Studio Add to Goose

Opens the app, which asks before it adds the server.

Or add it by command or config

Claude CodeTerminal

claude mcp add prism-coder -- npx -y prism-mcp-server

Claude Desktopclaude_desktop_config.json

{
  "mcpServers": {
    "prism-coder": {
      "command": "npx",
      "args": [
        "-y",
        "prism-mcp-server"
      ]
    }
  }
}

Cursor~/.cursor/mcp.json

{
  "mcpServers": {
    "prism-coder": {
      "command": "npx",
      "args": [
        "-y",
        "prism-mcp-server"
      ]
    }
  }
}

VS Code.vscode/mcp.json

{
  "servers": {
    "prism-coder": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "prism-mcp-server"
      ]
    }
  }
}

Codex~/.codex/config.toml

[mcp_servers.prism-coder]
command = "npx"
args = ["-y", "prism-mcp-server"]

Gemini CLITerminal

gemini mcp add --scope user prism-coder npx -- -y prism-mcp-server

Settings 12

`PRISM_STORAGE`	Optional: Storage backend: local, synalux, supabase or auto (default auto).
`PRISM_SYNALUX_API_KEY`	Optional: Paid Synalux portal key; unset means local-only.
`LOCAL_LLM_URL`	Optional: Ollama endpoint, default http://localhost:11434.
`BRAVE_API_KEY`	Optional: Brave Search key for the brave_* tools when no Synalux key is set.
`YDC_API_KEY`	Optional: Adds the youcom_web_search tool.
`PRISM_ENABLE_HIVEMIND`	Optional: true adds the agent_* multi-agent tools (off by default).
`PRISM_DARK_FACTORY_ENABLED`	Optional: false removes the Factory pipeline tools (on by default).
`PRISM_DASHBOARD_PORT`	Optional: Port of the local dashboard, default 3000.
`PRISM_FORCE_LOCAL`	Optional: true keeps local SQLite whatever credentials are set.
`PRISM_ACTR_ENABLED`	Optional: false turns off ACT-R ranking of memory search.
`PRISM_NO_UPDATE_CHECK`	Optional: 1 stops the daily npm update check.
`PRISM_DISABLE_HOOK_AUTOINSTALL`	Optional: 1 stops the server repairing hooks that prism connect installed.

What it does

Prism Coder is a stdio MCP server, published on npm as prism-mcp-server, that keeps a coding agent's working memory between sessions. It records an append-only session ledger and a per-project handoff (current state, open TODOs, changed files), and loads that context back at the start of the next conversation through session_bootstrap. On top of that store it offers keyword, semantic and graph search over saved knowledge, version history with checkout of older memory states, an image vault, exports to Markdown, JSON or a zipped vault, and goal-drift detection. By default everything lives in a local SQLite database at ~/.prism-mcp/data.db.

The second half is local inference. The prism_infer tool sends bounded work (tool routing, chat, code) to Ollama models from the author's prism-coder family (2B, 4B, 9B and 27B, chosen by installed models and free RAM), and local_savings reports how many tokens were served locally instead of by the cloud model. A paid Synalux subscription adds cloud memory sync, Gemini fallback when a local answer fails its checks, web search through the portal, and team features. The package also installs a prism CLI whose connect command writes the server into Claude Code, Claude Desktop, Cursor, Gemini CLI and Codex settings.

The tool list depends on settings. In src/server.ts at v20.21.25, 49 tools are always registered (eight search and inference tools plus 41 memory tools); session_task_route and the three Factory pipeline tools are on by default, so a default start shows 53. The three agent_* Hivemind tools appear only with PRISM_ENABLE_HIVEMIND=true and youcom_web_search only when YDC_API_KEY is set, for at most 57.

What it needs

Runtime	Node.js

Node.js with npm (the clients run it with npx, or install it globally with npm install -g prism-mcp-server). For local inference: Ollama plus at least one dcostenco/prism-coder model pulled (3.3 GB for 2b up to 16.8 GB for 27b). The brave_* search tools need BRAVE_API_KEY or a paid Synalux key. Cloud memory, Gemini fallback and team features need a Synalux subscription (Pro $15/month, Team $20/seat/month). The README's self-hosted full stack calls for a Mac M2 Pro or better (48 GB recommended) or Linux with an NVIDIA GPU.

Limits

Web search and scraping are not part of the free local tier. Multi-turn prism_infer needs a free Synalux account, and Gemini fallback, cloud sync and authenticated route correction need paid plans. The 27b model reads text only; image requests are refused when no installed tier can see images. The README's model accuracy figures come from the author's own tests. prism connect re-applies its subagent settings (Codex multi_agent off, Gemini enableAgents off, Claude Code subagent model pinned to sonnet) on every run, and the README warns the Gemini key may move and quietly stop working. Installing the plugin and running prism connect together registers the server twice.

Who it suits

Suits developers who move between Claude Code, Cursor, Codex or Gemini CLI and want project context, TODOs and decisions to carry over without a cloud account, especially those already running Ollama on a machine with enough RAM for the local models. The free tier keeps memory on the local disk. It is a large, opinionated system: it changes host subagent settings, adds hooks and exposes around 50 tools to the agent, so someone wanting a small key-value or notes memory server, or who will not let a tool edit their client configuration, should look for a lighter option. Teams needing shared memory across machines will need the paid Synalux tier.

Tools 57

session_bootstrap: Loads configured project context and greeting on the first turn
session_route_prompt: Routes each later turn to matching skills and context
skill_save: Saves a skill at local, user or team scope
skill_manage: Lists or deletes scoped skills and toggles platform skills
session_save_ledger: Appends an entry to the immutable session log
session_save_handoff: Updates the project's latest state for the next session
session_load_context: Reloads a project's saved context on request
knowledge_search: Searches stored knowledge by keyword
knowledge_forget: Removes stale or wrong memories
session_compact_ledger: Condenses old ledger entries
session_search_memory: Semantic search over memory using embeddings
memory_history: Shows the version timeline of a project's memory
memory_checkout: Restores memory to an earlier version
session_save_image: Stores an image in the media vault
session_view_image: Retrieves an image from the vault
session_health_check: Checks the memory store for integrity problems
session_backfill_embeddings: Fills in missing embeddings
session_forget_memory: Deletes memory entries outright
knowledge_set_retention: Sets an expiry period for a project's entries
session_save_experience: Records a typed experience event
knowledge_upvote: Raises an entry's importance
knowledge_downvote: Lowers an entry's importance
knowledge_sync_rules: Writes graduated insights into IDE rules files
deep_storage_purge: Drops full-size embeddings for compressed entries
session_export_memory: Exports memory as Markdown, JSON or a zipped vault
session_backfill_links: Creates graph links between existing entries
session_synthesize_edges: Adds inferred semantic links to the graph
session_cognitive_route: Routes a concept through the HDC policy layer
session_detect_drift: Checks whether a session has drifted from its goal
verify_behavior: Checks a planned change against recorded behaviour via the portal
maintenance_vacuum: Reclaims SQLite disk space
onboarding_wizard: Runs first-time setup
extract_entities: Pulls named entities out of raw text
api_analytics: Reports per-project usage
backup_database: Backs up or restores the SQLite database
configure_notifications: Sets up webhook, Slack or email alerts
query_memory_natural: Answers a plain-language question from memory
knowledge_ingest: Chunks code and stores it with generated Q&A in the graph
inference_metrics: Shows local versus cloud delegation statistics
local_savings: Reports tokens served locally instead of by the cloud model
sync_pull_handoff: Pulls an end-to-end encrypted handoff from another machine
prism_infer: Runs routing, chat or code generation on local Ollama models
brave_web_search: Searches the web through Brave
brave_web_search_code_mode: Brave web search with a JavaScript extraction step
brave_local_search: Searches local businesses and places through Brave
brave_local_search_code_mode: Brave local search with a JavaScript extraction step
code_mode_transform: Post-processes tool output with a JavaScript snippet
brave_answers: Returns a search-grounded answer from Brave
gemini_research_paper_analysis: Analyses a research paper with Gemini
session_task_route: Suggests whether a task stays with the host or goes local (on by default)
session_start_pipeline: Starts a Factory implementation pipeline (on by default)
session_check_pipeline_status: Reports a Factory pipeline's progress
session_abort_pipeline: Stops a running Factory pipeline
agent_register: Registers an agent with the Hivemind team (PRISM_ENABLE_HIVEMIND=true)
agent_heartbeat: Reports an agent as alive to the Hivemind
agent_list_team: Lists agents in the Hivemind team
youcom_web_search: Searches the web through You.com (only with YDC_API_KEY)

Popularity

48 popularity score, on our list (the bar is 36)

★ 156 ↓ 468/wk

GitHub stars	156	26.4 points
Stars in 30 days	+0	0 points
npm downloads, last week	468	21.4 points

Measured 2026-11-07. How the score works.

Where it is published

Code	dcostenco/prism-coder ★ 156
npm	prism-mcp-server 20.22.4, 2026-10-23

What it can reach

Runs	On your machine
Reaches	Files on your machine, A database, The internet
Changes things	Yes: it can write, send, create or delete
Sign-in	None
Licence	Apache-2.0 (npm)
Last code change	2026-10-28

Runs locally over stdio. Memory is kept in SQLite at ~/.prism-mcp/data.db unless a Synalux key or Supabase settings move it to the cloud; with cloud memory, memory text, file paths and queries go to the Synalux portal, redacted of personal identifiers. Tools write and delete memory, write export and IDE rules files, and search the web when Brave or You.com keys are set. Per the README, the entitlement check and telemetry contact the portal even when cloud inference, route correction and verification are all off. Five seconds after start, src/server.ts repairs prompt-routing hooks in host config that prism connect installed earlier (opt out with PRISM_DISABLE_HOOK_AUTOINSTALL=1). The dashboard binds to loopback behind a token by default (a fixed DNS-rebinding flaw: GHSA-9cvx-7x8q-3g6m).

Over time

GitHub stars 156 −2 (−1 %)

158156

10 Oct 20267 Nov 2026

npm downloads a week 468 −1.2k (−72 %)

3.4k468

30 Mar 20267 Nov 2026

Before the site measured it, read from npm's daily download counts.

Popularity score 48 −4 (−8 %)

5348

10 Oct 20267 Nov 2026

What is rising across the directory

Sources

Page checked 2026-10-15.

Badge for your README

Shows this server's rank in its category, and stars for a server that runs on your machine. It updates every hour.

MarkdownREADME.md

[![Prism Coder on EveryMCPServer](https://everymcpserver.com/badge/prism-coder.svg)](https://everymcpserver.com/servers/prism-coder)

Connect your client

Add in one click

Or add it by command or config

Settings 12

What it does

What it needs

Limits

Who it suits

Tools 57

Similar servers

OpenLore

Engram

Ruflo

agentmemory

MegaMemory

marm-memory