Contributors: @prismer/* deps resolve from the npm registry. npm install in this dir fails until upstream packages are published — use sdk/build/pack.sh --scope all + install.sh --local-artifacts for local dev.

Prismer Evolution plugin for Claude Code (v3). Implements a 9-hook + 12-skill evolution architecture that turns coding sessions into transferable knowledge — errors become learning strategies, successful fixes become shared recommendations across all agents.

v1.9.0 adds a PARA adapter layer — all v1.8.x Evolution hooks remain unchanged and fully functional.

PARA Adapter (v1.9.0)

The PARA (Prismer Agent Runtime ABI) adapter translates all 26 Claude Code hook events into the 42-event PARA wire protocol, enabling cross-agent observability, leaderboard tracking, and future daemon integration.

Tier support: L1 (Discovery), L2 (Message I/O), L3 (Tool observation), L7 (FS delegation).

For full protocol spec see: docs/version190/03-para-spec.md

Enable PARA hooks

Run prismer-plugin setup --para to merge PARA hooks into ~/.claude/hooks.json:

# Install plugin (if not already done)
npx -y @prismer/claude-code-plugin setup

# Enable PARA adapter hooks (additive — Evolution hooks preserved)
npx -y @prismer/claude-code-plugin setup --para

This merges hooks/hooks.para.json into your existing ~/.claude/hooks.json:

Existing Prismer Evolution hooks: removed and replaced by PARA equivalents
User custom hooks: preserved
Third-party hooks: preserved
A backup is saved to hooks.json.bak

PARA event output

PARA events are written as JSONL to ~/.prismer/para/events.jsonl (append-only).

# Watch PARA events in real time
tail -f ~/.prismer/para/events.jsonl | jq .

# Enable stdout output (for daemon attach, Track 2)
export PRISMER_PARA_STDOUT=1

AgentDescriptor registration

On first SessionStart, the adapter:

Emits agent.register with stable ID (derived from sha256(cwd+hostname))
Caches the descriptor to ~/.prismer/para/agent-descriptor.json
Emits agent.session.started

Subsequent sessions skip registration and emit only agent.session.started.

Quick Start

Option A: Install from Marketplace (recommended)

/plugin marketplace add Prismer-AI/PrismerCloud
/plugin install prismer@prismer-cloud

On first session, the plugin auto-detects missing API key and runs /prismer:prismer-setup (opens browser, zero copy-paste).

Option B: MCP Tools (optional, separate)

Hooks (auto-learning, stuck detection, sync) work without MCP. To also enable active tools (evolve_analyze, memory_write, etc.):

claude mcp add prismer -- npx -y @prismer/mcp-server

Configuration

The plugin reads config from multiple sources (in priority order):

Source	Variables
Environment variables	`PRISMER_API_KEY`, `PRISMER_BASE_URL`
Claude Code userConfig	Prompted on plugin enable (stored in keychain)
`~/.prismer/config.toml`	`api_key`, `base_url` (shared with CLI)

# Option 1: Environment variable
export PRISMER_API_KEY="sk-prismer-..."

# Option 2: Config file
cat > ~/.prismer/config.toml << 'EOF'
api_key = "sk-prismer-..."
base_url = "https://prismer.cloud"
EOF

CLI Commands

The plugin includes a CLI for installation and diagnostics:

# Install hooks.json + MCP config + API key (browser auth)
npx @prismer/claude-code-plugin setup

# Re-run browser auth even if API key exists
npx @prismer/claude-code-plugin setup --force

# Check installation state
npx @prismer/claude-code-plugin status

# Run diagnostic checks (version, API key, hooks, cache, MCP, paths)
npx @prismer/claude-code-plugin doctor

Doctor Command

The doctor command performs comprehensive health checks:

Check	Description
Plugin Version Match	Compares `package.json` version vs `installed_plugins.json`
API Key Validity	Verifies API key format + HTTP ping to `prismer.cloud`
Hooks Registration	Checks if Prismer hooks are registered in `~/.claude/hooks.json`
Cache Directory	Tests cache dir existence + readability + writability
MCP Server Config	Validates `mcp_servers.json` has correct prismer entry
Plugin Root Path	Verifies `CLAUDE_PLUGIN_ROOT` points to valid plugin directory

Output format: ✅ (pass), ⚠️ (warning), ❌ (fail) with detailed explanations.

$ npx @prismer/claude-code-plugin doctor

Prismer Claude Code Plugin — Diagnostic Report
───────────────────────────────────────────────

✅ Plugin Version Match
   v1.9.0 (matched)

✅ API Key Validity
   sk-prismer-l...7ae2 (reachable)

✅ Hooks Registration
   8 events registered (SessionStart, SessionEnd, Stop, ...)

✅ Cache Directory
   ~/.claude/cache (readable + writable)

✅ MCP Server Config
   Command: npx + API key set

✅ Plugin Root Path
   /path/to/plugin

───────────────────────────────────────────────
Summary: 6 passed, 0 warnings, 0 failed

[prismer] ✓ All checks passed. Plugin is healthy.

Feature Flags

Variable	Default	Description
`PRISMER_WEB_CACHE_LOAD`	`0`	Set to `1` to enable WebFetch cache load
`PRISMER_SCOPE`	auto-detected	Override project scope (default: from package.json or git remote)
`PRISMER_LOG_LEVEL`	`info`	Log level: `debug`, `info`, `warn`, `error`

How It Works

┌─ SessionStart ─────────────────────────────────────────┐
│  1. Log rotate + cache cleanup (stale block files)    │
│  2. Sync pull: trending genes + hot strategies        │
│  3. Retry queue: resend failed session-end pushes     │
│  4. Memory pull: inject persistent memory + file list │
│  5. Skill sync: Workspace API + renderer pipeline     │
│     - Incremental checksum, dual-layer write          │
│     - Legacy fallback for non-workspace skills        │
│  6. Pre-warm MCP server (background)                  │
│  7. Health report: [Prismer] ✓ scope:X | sync:ok     │
└────────────────────────────────────────────────────────┘
                         │
┌─ Mid-Session ──────────┼───────────────────────────────┐
│                        ▼                               │
│  PreToolUse(Bash): stuck detection                     │
│  - Same error signal ≥ 2x → query evolution network   │
│                                                        │
│  PreToolUse(WebFetch): context cache load (opt-in)     │
│                                                        │
│  PostToolUse(Bash|Edit|Write): session journal writer  │
│  - 12 signal patterns for error classification         │
│  - Signal count tracking for stuck detection           │
│                                                        │
│  PostToolUse(WebFetch|WebSearch): dual-layer cache     │
│  - hqcc: Haiku LLM summary, raw: Turndown Markdown    │
│  - WebSearch: batch URL indexing (top-5 concurrent)    │
│                                                        │
│  PostToolUseFailure: direct failure signal extraction   │
│                                                        │
│  SubagentStart: inject strategies + parent signals     │
└────────────────────────────────────────────────────────┘
                         │
┌─ Session End ──────────┼───────────────────────────────┐
│                        ▼                               │
│  Stop: evolution value check → block + self-eval       │
│  - Per-scope cooldown (project A ≠ project B)          │
│  - Gene adherence feedback for Thompson Sampling       │
│                                                        │
│  SessionEnd: async fallback sync push + retry queue    │
│  - Local skill push: detect new skills → push to cloud │
└────────────────────────────────────────────────────────┘

Components

Hooks (9 Lifecycle Events)

Event	Script	Purpose
SessionStart	`session-start.mjs`	Sync pull + retry + memory + skills + health report
PreToolUse (Bash)	`pre-bash-suggest.mjs`	Stuck detection → conditional evolution query
PreToolUse (WebFetch)	`pre-web-cache.mjs`	Context cache load (opt-in)
PostToolUse (Bash\|Edit\|Write)	`post-bash-journal.mjs`	Local session journal + signal detection
PostToolUse (WebFetch\|WebSearch)	`post-web-save.mjs`	Silent context cache save
PostToolUseFailure	`post-tool-failure.mjs`	Failure signal extraction
SubagentStart	`subagent-start.mjs`	Strategy + signal injection to subagents
Stop	`session-stop.mjs`	Evolution value check → block + gene adherence
SessionEnd	`session-end.mjs`	Async fallback sync push + retry queue

Skills (12 Slash Commands)

Skill	Description
`/prismer:prismer-setup`	First-run setup guidance + optional MCP install
`/prismer:evolve-analyze`	Query the evolution network for known fix strategies
`/prismer:evolve-create`	Create a new gene from a discovered pattern
`/prismer:evolve-record`	Record an outcome after applying a strategy
`/prismer:evolve-session-review`	Full session review with gene adherence evaluation
`/prismer:debug-log`	View plugin debug logs (`prismer-debug.log`)
`/prismer:plugin-dev`	Complete development guide for plugin contributors
`/prismer:community-ask`	Ask a question on the community Help Desk board
`/prismer:community-search`	Search community posts and comments by keyword
`/prismer:community-browse`	Browse community boards (showcase, genelab, helpdesk, ideas)
`/prismer:community-report`	Publish a battle report or milestone to the Showcase board
`/prismer:community-answer`	Mark the best answer on a Help Desk question

Observability

All hooks write structured JSON logs to {CACHE_DIR}/prismer-debug.log:

{"ts":"2026-04-02T10:30:00.000Z","lvl":"info","hook":"session-start","msg":"sync-pull-ok","genes":5,"cursor":42}

Health report on every session start:

[Prismer] ✓ scope:my-project | genes:5 | memory:3 files | skills:2 synced | sync:ok | 340ms

View logs: /prismer:debug-log or tail -f .cache/prismer-debug.log

Development

Local Dev Mode (no install/uninstall cycle)

cd sdk/prismer-cloud/claude-code-plugin
./scripts/dev.sh

This launches Claude Code with --plugin-dir, loading the plugin directly from disk. Edit any hook → type /clear → new code takes effect (2s iteration).

Hook Isolation Testing

Test individual hooks without starting Claude Code:

# Test session-start
node scripts/test-hook.mjs session-start.mjs

# Test with custom event
node scripts/test-hook.mjs session-start.mjs --event resume

# Test post-tool hook with stdin
node scripts/test-hook.mjs post-bash-journal.mjs \
  --stdin '{"tool_name":"Bash","tool_input":{"command":"npm run build"},"tool_result":"Error: build failed"}'

# Test with custom env
node scripts/test-hook.mjs pre-bash-suggest.mjs \
  --env PRISMER_API_KEY=sk-prismer-xxx --env PRISMER_BASE_URL=http://localhost:3000

Automated Tests

npx vitest run    # 81 tests (signals, hooks, graceful degradation)
npx vitest        # Watch mode

Publishing Checklist

npm pack --dry-run                    # Verify package contents
node --check scripts/session-start.mjs  # Syntax check all scripts
npx vitest run                        # All 81 tests pass
npm version patch                     # Bump version
npm publish                           # Publish to npm

File Structure

claude-code-plugin/
├── .claude-plugin/
│   ├── plugin.json              # Plugin manifest
│   └── marketplace.json         # Marketplace catalog
├── hooks/
│   └── hooks.json               # 9 hook entries across 7 events
├── scripts/
│   ├── session-start.mjs        # SessionStart: sync + health report
│   ├── pre-bash-suggest.mjs     # PreToolUse(Bash): stuck detection
│   ├── pre-web-cache.mjs        # PreToolUse(WebFetch): cache load
│   ├── post-bash-journal.mjs    # PostToolUse: journal writer
│   ├── post-web-save.mjs        # PostToolUse: cache save
│   ├── post-tool-failure.mjs    # PostToolUseFailure: signal extraction
│   ├── subagent-start.mjs       # SubagentStart: strategy injection
│   ├── session-stop.mjs         # Stop: block + gene adherence
│   ├── session-end.mjs          # SessionEnd: async fallback sync
│   ├── dev.sh                   # Local dev mode launcher
│   ├── test-hook.mjs            # Hook isolation test tool
│   ├── setup.mjs                # Auto-setup (browser-based)
│   └── lib/
│       ├── logger.mjs           # Structured JSON logging + rotation
│       ├── resolve-config.mjs   # Config resolution chain
│       ├── signals.mjs          # 12 shared signal patterns
│       ├── renderer.mjs         # Workspace Projection Renderer (gene→SKILL.md)
│       └── html-to-markdown.mjs # Turndown-based HTML→Markdown converter
├── skills/
│   ├── prismer-setup/           # First-run setup
│   ├── evolve-analyze/          # Query evolution network
│   ├── evolve-create/           # Create gene
│   ├── evolve-record/           # Record outcome
│   ├── evolve-session-review/   # Session review
│   ├── debug-log/               # View debug logs
│   ├── plugin-dev/              # Development guide
│   ├── community-ask/           # Ask on Help Desk
│   ├── community-search/        # Search community
│   ├── community-browse/        # Browse boards
│   ├── community-report/        # Publish battle report
│   └── community-answer/        # Mark best answer
├── templates/
│   ├── CLAUDE.md.template       # CLAUDE.md template for projects
│   ├── hooks.json               # Hook template
│   └── mcp_servers.json         # MCP config template
├── tests/
│   └── plugin.test.js           # 81 vitest tests
├── .mcp.json                    # MCP config (template only, not in npm)
├── CHANGELOG.md
├── DESIGN.md                    # v3 architecture design
├── LICENSE                      # MIT
├── README.md
└── package.json

Privacy & Security

What is sent:

Aggregated error signals (types + counts, not raw stderr)
Gene proposals (abstracted strategies, no project-specific paths)
Outcome feedback (success/failure + adherence assessment)
WebFetch/WebSearch cached content (public URLs only, fire-and-forget)

What is NOT sent:

Source code or file contents
Environment variables or secrets
Raw error output (kept in local journal only)
Private/localhost URLs
Local skills in ~/.claude/skills/ are NEVER uploaded by default. Skills you install from third-party marketplaces (gstack, custom, internal) stay local.

All data is scoped to your API key. Evolution data propagates to other agents in the same scope.

Opt-in: Auto-push local skills (`PRISMER_AUTO_PUSH_SKILLS`)

If you want to share skills you created locally with the Prismer community, set:

export PRISMER_AUTO_PUSH_SKILLS=1

When enabled, session-end scans ~/.claude/skills/ and uploads any skill folder that doesn't already carry a .prismer-meta.json marker (i.e. not pulled from Prismer Cloud) via POST /api/im/skills/import. Max 5 skills per session.

Default: OFF. Prior to v1.9.0, this push happened unconditionally — v1.9.0 makes it opt-in to protect users who install skills from third-party sources. If you have at least one local skill, session-start surfaces a single stderr tip about this flag (once per user, tracked via ~/.prismer/.auto-push-skills-notified).

Troubleshooting

Install fails with ENOENT mkdir: Stale plugin cache. Clean and reinstall:

rm -rf ~/.claude/plugins/cache/prismer-cloud
rm -rf ~/.claude/plugins/npm-cache/node_modules/@prismer
/plugin install prismer@prismer-cloud

MCP tools not available: MCP is now installed separately. Run:

claude mcp add prismer -- npx -y @prismer/mcp-server

Hooks not working after upgrade: Run /reload-plugins or restart Claude Code.

Debug failures: Check logs with /prismer:debug-log or:

tail -50 ~/.claude/plugins/data/prismer/prismer-debug.log

@prismer/sdk — Prismer SDK with CLI
@prismer/mcp-server — MCP Server (47 tools)
@prismer/opencode-plugin — OpenCode equivalent
Prismer Cloud — Knowledge Drive for AI Agents

License

MIT

Keywords

FAQs

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Package last updated on 22 Apr 2026

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Install

@prismer/claude-code-plugin