Prism Coder

Give your AI agent memory that lasts. Persistent sessions, knowledge graphs, and offline tool-routing — fully local and free.

Prism Coder is an MCP server that gives Claude, Cursor, and other AI tools long-term memory that survives across sessions. It ships with the open-weight prism-coder model fleet (2B–27B) for fast, offline tool-routing — no cloud required.

No account needed. No API keys. Runs on your machine.
A paid subscription adds cloud sync, higher model tiers, and team features through the Synalux portal.

What Prism gives you

• Session memory that survives restarts — resume projects with handoff notes, recent work, open TODOs, and configurable quick, standard, or deep context.
• Local-first inference — bounded work is routed through local Ollama models first, with automatic 2B/4B/9B/27B selection based on installed models, available RAM, context fit, and subscription entitlements.
• Route-output enforcement — route mode returns only well-formed calls to tools the host actually advertised. Standard and higher plans can add authenticated deterministic correction; route_guard: "local" keeps the prompt and draft entirely on-device.
• One setup for every agent — prism connect configures Claude Code, Claude Desktop, Cursor, Gemini CLI, and Codex while preserving unrelated settings.
• Subscription-aware skills — entitled skills are synchronized before the host launches, with safe upgrades, downgrades, conflict preservation, and offline last-good recovery.
• Hook-free startup — MCP metadata and native instructions request Prism's startup context without requiring lifecycle hooks or a Prism-owned launcher.
• Safe escalation and observability — inference outcomes are explicit, reserved content remains fail-closed, and local/cloud usage is recorded for review.

Get started

npm install -g prism-mcp-server
prism connect

Use prism connect --dry-run to preview changes, prism connect --all to configure every detected host, or prism connect --refresh to reconcile Prism-managed entries after an upgrade. Restart the host after connecting.

Prism works locally without an account, API key, or cloud subscription. Add a Synalux subscription when you want cloud memory, paid-tier skills, or team features.

What's New in v20.2.7

Session Saves Survive Agent Restarts

Prism now remembers that a conversation successfully loaded its project context when the MCP server restarts or another Prism process handles the next request. session_save_ledger and session_save_handoff no longer fail with a false context_not_loaded error in that flow.

The recovery remains fail-closed: authorization is limited to the exact project and conversation, expires with the existing context window, and stores no plaintext conversation identifier. Cross-project, forged, malformed, expired, or future-dated receipts are still rejected. The release also updates PostCSS to the patched 8.5.23 release.

What's New in v20.3.0

Hybrid Memory Search (Portal Tier)

session_search_memory on the portal tier (Synalux-backed installs) now fuses semantic similarity with exact-term lexical matching via weighted reciprocal-rank fusion. Measured on blind probes against a real 8.5k-entry corpus: fused retrieval was never worse than semantic alone at top-5, and exact identifiers — TPNs, function names, error strings — now rescue queries that embedding similarity blurs. Results say how they were found — hybrid retrieval headers, per-hit sem#/lex# arms — and a lexical-only rescue is labelled exact-term match instead of pretending to a similarity score. Local SQLite installs keep pure vector search; hybrid needs the portal's lexical index.

What's New in v20.2.6

Safer Configuration Updates Across Every Agent

prism connect now reads Claude, Cursor, Gemini, and Codex configuration through a single verified file snapshot, preventing another process from swapping a file between Prism's safety check and its read. Supported symlinked dotfiles still work, while dangling or planted symlinks fail loudly instead of being followed or overwritten. This release also carries the patched dependencies and cross-platform release checks introduced in v20.2.5.

Cloud fallback is now documented consistently as Gemini 3.6 Flash. Plan ceilings govern automatic prism_infer routing; direct use of any downloaded model through local Ollama remains free on every tier.

What's New in v20.2.4

Reliable Session Memory That Shows Work, Not Greetings

Greeting-only assistant replies are skipped before ledger writes. Existing greeting rows are filtered at read time across native startup, MCP context, and prism load --json, while entries containing decisions, TODOs, changed files, or non-session events remain visible. Historical rows are not destructively deleted. If Synalux has a transient startup failure, Prism displays one bounded local last-good snapshot and clearly labels it; permanent authorization or validation failures still fail loud, and later writes remain cloud-routed.

What's New in v20.2.2

One Local-First Workflow Across Every Agent

prism connect now installs one orchestration contract for Claude Code, Claude Desktop, Cursor, Gemini CLI, and Codex. Bounded delegated work goes to session_task_route and the local prism_infer worker first; routine work must not create background host agents. Local workers can receive the active project's dashboard-configured quick, standard, or deep memory and select a RAM-safe 2B/4B/9B/27B model at call time. The router forwards complexity but does not choose the model; prism_infer owns the final decision using memory and context fit, installed models, live RAM, entitlements, and explicit caller overrides.

Codex and Gemini native agent fan-out are disabled during connect. Codex keeps a two-thread, one-level Terra/low fallback profile if the developer explicitly re-enables native agents later. Claude Code keeps native agents as a last-resort path but pins their model to Sonnet. Cursor and Claude Desktop do not expose a supported global subagent-policy file, so they receive the identical workflow through Prism's MCP server instructions. prism_infer safety boundaries and the host's final verification responsibility are unchanged.

Subscription-Tier Skills Arrive Before the First Host Launch

prism connect now downloads the authoritative Synalux skill manifest and materializes entitled packages in the native ~/.agents/skills directory before the command exits. Codex therefore sees the current skillset on its first launch instead of requiring a second restart. Prism rechecks the same snapshot at MCP startup, session load, and every five minutes—without host lifecycle hooks.

On the first user turn, Prism's native skill, MCP metadata, and managed host instructions request one session_bootstrap({}) call. Prism then uses the dashboard's developer name, Auto-Load Projects, and quick, standard, or deep setting. The response stays focused on greeting and session state because tier skills are already present in the host's native skill directory.

Hook-free MCP can provide and prioritize that ready-to-display block, but the host model still owns the final assistant message and may summarize it. Prism does not claim a deterministic verbatim greeting on third-party chat surfaces; that would require a host lifecycle hook, launcher, extension, or Prism-owned panel. Context loading itself remains complete even when a host shortens the visible reply.

Free accounts receive only the public hook-free prism-startup package; the MCP server still supplies a compact, non-proprietary safety and evidence contract. Authenticated paid accounts receive the protected behavioral and engineering packages plus the current subscribed routing set. The paid evidence-first-protocol keeps ordinary coding lightweight: one correlated reproduction is enough to begin an edit, while strict acceptance starts only before a completion claim, push, or release and inspects only the exact artifacts used as proof. Upgrades install newly entitled packages; verified downgrades remove only Prism-owned packages while preserving local skills and locally modified conflicts.

When upgrading an older Claude Code installation, prism connect removes only the exact Prism-owned startup, skill-sync, handoff, and drift hook actions from the legacy bootstrap. It also removes the recognized legacy Prism startup sections from ~/CLAUDE.md, preserves every other instruction, and installs a small ownership-marked native block that selects session_bootstrap({}) on the first turn. User hooks, custom instruction sections, and near matches remain untouched; native skills and server-side reminders preserve those Prism features without host lifecycle hooks. Because hosts expose no native session-end callback, handoff at shutdown is instruction-driven rather than a guaranteed lifecycle event.

After Claude Code's native user registration succeeds, the same default or --refresh command checks the nearest .mcp.json from the current directory through the home directory.