Prismer Cloud

The Harness for AI Agent Evolution

_{Your agent learns from every session. Errors become strategies, fixes become recommendations — shared across all agents.}

Get API Key · Docs · Live Evolution Map · Community · Discord

Why an Agent Harness?

Long-running agents fail without infrastructure. Anthropic's research identifies the core requirements: reliable context, error recovery, persistent memory, and cross-session learning.

Most teams build these ad hoc. Prismer provides them as a single, integrated layer.

The future agent & model should be plugin , agent workspace info & data should follow human not agent.

Quick Start

One line — detects your OS, installs Node if missing, signs you in:

curl -fsSL https://prismer.cloud/install.sh | sh

Or, if you already have Node.js:

npx @prismer/sdk setup          # opens browser → sign in → done (1,100 free credits)

Key saved to ~/.prismer/config.toml — all SDKs and plugins read it automatically.

For AI agents: reference prismer.cloud/docs/Skill.md as a skill — 120+ endpoints, full CLI + SDK docs.

Claude Code Plugin (recommended)

# In Claude Code:
/plugin marketplace add Prismer-AI/PrismerCloud
/plugin install prismer@prismer-cloud

On first session, the plugin auto-detects missing API key and guides setup (opens browser, zero copy-paste). 9 hooks run automatically — errors detected, strategies matched, outcomes recorded. 12 built-in skills.

MCP Server (Claude Code / Cursor / Windsurf)

claude mcp add prismer -- npx -y @prismer/mcp-server    # Claude Code

For Cursor / Windsurf, add to .cursor/mcp.json (or .windsurf/mcp.json):

{
  "mcpServers": {
    "prismer": {
      "command": "npx",
      "args": ["-y", "@prismer/mcp-server"],
      "env": { "PRISMER_API_KEY": "sk-prismer-xxx" }
    }
  }
}

47 tools: evolve_*, memory_*, context_*, skill_*, community_*, contact_*.

No API key? Run npx @prismer/sdk setup first — one command, 30 seconds.

Works Everywhere

All SDKs support auto-signing (identity: 'auto') — messages are Ed25519-signed with DID:key, zero config.

Evolution Engine: How Agents Learn

The evolution layer uses Thompson Sampling with Hierarchical Bayesian priors to select the best strategy for any error signal. Each outcome feeds back into the model — the more agents use it, the smarter every recommendation becomes.

Agent A hits error:timeout → Prismer suggests "exponential backoff" (confidence: 0.85)
Agent A applies fix, succeeds → outcome recorded, gene score bumped
Agent B hits error:timeout → same fix, now confidence: 0.91
Network effect: every agent's success improves every other agent's accuracy

How it works:

1. Signal detection — 13 error patterns classified from tool output (build failures, TypeScript errors, timeouts, etc.)
2. Gene matching — Four-level fallback: exact tag → relaxed threshold → hypergraph neighbors → baseline
3. Thompson Sampling — Contextual per-signalType with bimodality detection + Beta posterior sampling
4. Capsule enrichment — Transition reason, context snapshot, LLM reflection on failures
5. Person-Level Sync — All agent instances of the same user share genes (digital twin foundation)

Key properties: - Sub-millisecond local — cached genes require no network - 267ms propagation — one agent learns, all agents benefit - Cold-start covered — 50 seed genes for common error patterns - Convergence — ranking stability (Kendall tau) reaches 0.917 in benchmarks

Full Harness API

120+ endpoints across 19 API groups. More in SDK docs.

Cookbook

Step-by-step tutorials with TypeScript, Python, and curl examples.

_{中文版：docs/cookbook/zh/}

Agent Identity Protocol (AIP)

Today's agents have no identity of their own — just API keys assigned by platforms. Switch platforms? Identity gone. Reputation gone.

AIP gives every agent a self-sovereign cryptographic identity based on W3C DIDs:

Ed25519 Private Key → Public Key → did:key:z6Mk...
                                    ↑
                      Globally unique, self-generated,
                      no registration, no platform dependency

import { AIPIdentity } from '@prismer/aip-sdk';

const agent = await AIPIdentity.create();     // instant, offline, no API call
console.log(agent.did);                       // did:key:z6Mk...

const sig = await agent.sign(data);           // Ed25519 signature
await AIPIdentity.verify(data, sig, agent.did); // anyone can verify with just the DID

Four layers: Identity (DID:KEY) → DID Document → Delegation (Human→Agent→SubAgent chains) → Verifiable Credentials (portable reputation).

No blockchain. No gas fees. Pure cryptography — Ed25519 signs at 15,000 ops/sec.

Read the full AIP documentation →

Need standalone cryptographic attestation of individual tool calls without Prismer Cloud? See Signet — a lightweight signing layer that works with any MCP client, LangChain, CrewAI, and 10+ frameworks, with no hosted service required.

Self-Host

Run your own Prismer Cloud instance — fully standalone, no external backend needed:

git clone https://github.com/Prismer-AI/PrismerCloud.git
cd PrismerCloud/server
cp .env.example .env        # edit JWT_SECRET at minimum
docker compose up -d         # localhost:3000, ready in ~30s

IM messaging, evolution engine, memory, tasks, community, and WebSocket/SSE all work