Prism

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 v20.4.0

An Explicitly Named Cloud Backend Fails Loud

Setting PRISM_STORAGE=synalux or =supabase with incomplete credentials used to downgrade silently to local SQLite. The switch was logged to stderr, which MCP hosts discard, so nothing surfaced it: sessions kept serving stale local context while the cloud held newer history, and context_source read local rather than any kind of warning. A session could run that way for weeks.

Naming a backend outright is a strong statement of intent, so it now throws — naming the missing variables and the PRISM_STORAGE=local opt-out — instead of quietly splitting your session history. auto is unchanged: it keeps its documented synalux > supabase > local degradation, pinned by a test.

Upgrade note: if you explicitly set PRISM_STORAGE=synalux|supabase and your credentials are incomplete, startup now fails with a named error instead of silently using local data. That error is the fix — set the missing variable, or choose PRISM_STORAGE=local deliberately. Default (auto) configs are unaffected.

The throw is deliberately not treated as a recoverable startup fault: that path exists for transient errors (rate limits, 5xx, DNS), which may degrade behind a visible notice. A missing credential is a configuration fault and must not be papered over.

Also: the skill block is now budgeted by default rather than only on request, so a large skill payload cannot crowd out briefing and history.

What's New in v20.3.2

Web Scholar: SSRF Hardening

Security release. Web Scholar scrapes article URLs that come from search-engine output, so the target is attacker-influenceable through SEO poisoning — and because what it scrapes is written into the memory corpus and passed to the configured LLM, a redirection to a local address meant reading an internal service and sending the result onward.

The host guard matched string prefixes instead of parsing the address, and six spellings of a local address got through: [::1] (URL.hostname keeps the brackets), 127.0.0.2 (only .1 was enumerated, not all of 127.0.0.0/8), 0.0.0.0, [::ffff:127.0.0.1], localhost. (a trailing dot defeated every suffix check at once), and [64:ff9b::7f00:1] (NAT64 embeds IPv4 in its low bits). Host classification now parses addresses and also covers CGNAT, benchmarking, multicast, reserved, and IPv6 unique-local and link-local ranges.

DNS rebinding is closed too. Every check read the URL string, so a hostname the attacker controls passed all of them and could still resolve to 127.0.0.1. Targets are now resolved first, every returned address is validated, and the connection is pinned to those addresses so the name is never resolved a second time — which also shuts the window between the check and the connect.

Scrape failures no longer vanish into a bare catch {}, a run is bounded by PRISM_SCHOLAR_SCRAPE_BUDGET_MS (default 60s) instead of stalling on a raised article count, and responses are capped at 8 MiB.

This is reachable only when scholar actually runs — scholar_research, or the background loop under PRISM_SCHOLAR_ENABLED=true — and when the attacker also controls DNS or a search result. Upgrade if you use Web Scholar.

What's New in v20.3.1

Prism Browser Reports Real Failures

prism browser could not fail a test. eval 1 === 2 returned status: ok with exit code 0, a page serving HTTP 500 reported status: ok, and console errors and uncaught page exceptions were discarded entirely. This release adds assertions — assert-text, assert-visible, assert-count, assert-url, assert-title, assert-eval, assert-no-page-errors — that return status: failed and a non-zero exit. open now reports http_status and fails on 400 or higher, screenshots are validated rather than assumed, and eval returns native JSON with its type instead of a Python repr.

The fingerprint layer had never been applied: a wrong keyword argument made the stealth library throw on every launch — 1,139 failures and 0 successes since April — while the runner reported it as active. It is fixed, and a layer that cannot be applied now fails loudly. The headless build no longer advertises itself through navigator.userAgentData or the Sec-CH-UA header, and a patch that corrupted Object.getOwnPropertyDescriptor on every page under test has been removed. These remain best-effort test aids, not a guarantee against bot detection.

--local-only now actually isolates: WebSocket, EventSource, WebRTC and sendBeacon egress bypass request routing and were never blocked, and service workers were allowed through. --cleanup was a no-op in the two modes agents use. Site isolation, phishing detection and popup blocking are no longer disabled by default, since these profiles hold live authenticated cookies.

New for test runs: --ephemeral-profile and --storage-state for hermetic authenticated flows, pages/switch-page so OAuth popups are reachable, --fail-fast, --fast, --trace/--video/--har, and profiles --prune-older-than for profile maintenance.

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 pin

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