diff --git a/packages/skills/brain/.env.example b/packages/skills/brain/.env.example
new file mode 100644
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--- /dev/null
+++ b/packages/skills/brain/.env.example
@@ -0,0 +1,11 @@
+# Mosaic Brain Configuration Example
+# Copy to ~/.config/mosaic/brain.conf and fill in your values
+
+# Mosaic Stack API URL
+MOSAIC_API_URL=http://localhost:3001
+
+# Your workspace UUID (get from Mosaic Stack web app)
+MOSAIC_WORKSPACE_ID=
+
+# Your API authentication token (get from Mosaic Stack settings)
+MOSAIC_API_TOKEN=
diff --git a/packages/skills/brain/README.md b/packages/skills/brain/README.md
new file mode 100644
index 0000000..b632946
--- /dev/null
+++ b/packages/skills/brain/README.md
@@ -0,0 +1,98 @@
+# Mosaic Brain Skill
+
+A Clawdbot skill for integrating with Mosaic Stack's Ideas/Brain API.
+
+## Features
+
+- **Quick Brain Dump**: Capture ideas rapidly with `capture` command
+- **Semantic Search**: Query your knowledge base using natural language
+- **Full CRUD**: Create, read, update, delete ideas with rich metadata
+- **Tag Management**: Organize ideas with tags
+- **Flexible Queries**: Filter by status, tags, dates, and more
+
+## Installation
+
+1. Copy this skill to your Clawdbot skills directory or link it:
+   ```bash
+   ln -s ~/src/mosaic-stack/packages/skills/brain ~/.config/clawdbot/skills/mosaic-brain
+   ```
+
+2. Configure your Mosaic Stack connection:
+   ```bash
+   mkdir -p ~/.config/mosaic
+   cat > ~/.config/mosaic/brain.conf <<EOF
+   MOSAIC_API_URL=http://localhost:3001
+   MOSAIC_WORKSPACE_ID=your-workspace-uuid
+   MOSAIC_API_TOKEN=your-auth-token
+   EOF
+   ```
+
+3. Verify setup:
+   ```bash
+   ./brain.sh list --limit 5
+   ```
+
+## Usage
+
+See [SKILL.md](./SKILL.md) for detailed usage documentation.
+
+### Quick Examples
+
+```bash
+# Capture a quick thought
+./brain.sh capture "Need to implement user authentication for the new app"
+
+# Create detailed idea
+./brain.sh create \
+  --title "Authentication System" \
+  --content "Implement OAuth2 + JWT auth..." \
+  --tags "backend,security,auth" \
+  --priority "HIGH"
+
+# Search semantically
+./brain.sh query "What did I say about authentication?"
+
+# List recent ideas
+./brain.sh list --limit 10
+
+# Update an idea
+./brain.sh update <id> --status "IN_PROGRESS" --add-tags "urgent"
+```
+
+## API Reference
+
+This skill interfaces with the following Mosaic Stack endpoints:
+
+- `POST /api/ideas/capture` - Quick capture
+- `POST /api/ideas` - Create full idea
+- `GET /api/ideas` - List ideas
+- `GET /api/ideas/:id` - Get idea
+- `PATCH /api/ideas/:id` - Update idea
+- `DELETE /api/ideas/:id` - Delete idea
+- `POST /api/brain/query` - Semantic query
+- `GET /api/brain/search` - Keyword search
+
+## Development
+
+### Requirements
+
+- `curl` - HTTP client
+- `jq` - JSON processor
+- Mosaic Stack API running and accessible
+
+### Testing
+
+```bash
+# Test capture
+./brain.sh capture "Test idea $(date)"
+
+# Test search
+./brain.sh search "test"
+
+# Test query
+./brain.sh query "recent test ideas"
+```
+
+## License
+
+Part of the Mosaic Stack ecosystem.
diff --git a/packages/skills/brain/SKILL.md b/packages/skills/brain/SKILL.md
new file mode 100644
index 0000000..be01259
--- /dev/null
+++ b/packages/skills/brain/SKILL.md
@@ -0,0 +1,139 @@
+---
+name: mosaic-brain
+description: Capture ideas, brain dumps, and semantic search across your Mosaic Stack knowledge base.
+homepage: https://mosaicstack.dev
+metadata: {"clawdbot":{"emoji":"🧠","requires":{"bins":["curl","jq"]}}}
+---
+
+# Mosaic Brain
+
+Capture and search ideas, brain dumps, and notes in your Mosaic Stack workspace. Provides quick capture, semantic search, and tag management.
+
+## Setup
+
+1. Ensure Mosaic Stack API is running (default: `http://localhost:3001`)
+2. Set environment variables:
+   ```bash
+   export MOSAIC_API_URL="http://localhost:3001"
+   export MOSAIC_WORKSPACE_ID="your-workspace-uuid"
+   export MOSAIC_API_TOKEN="your-auth-token"
+   ```
+
+3. Optionally create `~/.config/mosaic/brain.conf`:
+   ```bash
+   MOSAIC_API_URL=http://localhost:3001
+   MOSAIC_WORKSPACE_ID=your-workspace-uuid
+   MOSAIC_API_TOKEN=your-auth-token
+   ```
+
+## Common Commands
+
+### Quick Brain Dump
+Capture an idea quickly without thinking about categorization:
+```bash
+# Quick capture
+./brain.sh capture "Had a great idea about using AI for code reviews"
+
+# Capture with title
+./brain.sh capture "Remember to follow up with the team about the new feature" --title "Team Follow-up"
+```
+
+### Create Detailed Idea
+Create an idea with full metadata:
+```bash
+./brain.sh create \
+  --title "New Feature Idea" \
+  --content "Implement semantic search across all documents..." \
+  --tags "feature,ai,search" \
+  --category "product"
+```
+
+### Semantic Search
+Search your brain using natural language:
+```bash
+# Query your knowledge base
+./brain.sh query "What did I say about AI and code reviews?"
+
+# Search with limit
+./brain.sh search "project ideas" --limit 10
+```
+
+### List Ideas
+```bash
+# List recent ideas
+./brain.sh list
+
+# List with filters
+./brain.sh list --limit 20 --tags "work,urgent"
+```
+
+### Get Specific Idea
+```bash
+./brain.sh get <idea-id>
+```
+
+### Update Idea
+```bash
+./brain.sh update <idea-id> \
+  --title "Updated Title" \
+  --tags "new,tags" \
+  --status "IN_PROGRESS"
+```
+
+### Delete Idea
+```bash
+./brain.sh delete <idea-id>
+```
+
+### Tag Management
+```bash
+# List all tags
+./brain.sh tags
+
+# Add tags to an idea
+./brain.sh update <idea-id> --add-tags "urgent,review"
+
+# Remove tags from an idea
+./brain.sh update <idea-id> --remove-tags "old-tag"
+```
+
+## API Endpoints
+
+The skill uses these Mosaic Stack API endpoints:
+
+- **POST /api/ideas/capture** - Quick brain dump (minimal fields)
+- **POST /api/ideas** - Create full idea with metadata
+- **GET /api/ideas** - List ideas with filters
+- **GET /api/ideas/:id** - Get specific idea
+- **PATCH /api/ideas/:id** - Update idea
+- **DELETE /api/ideas/:id** - Delete idea
+- **POST /api/brain/query** - Semantic search/query
+- **GET /api/brain/search** - Search ideas
+
+## Configuration
+
+Config file priority:
+1. Environment variables
+2. `~/.config/mosaic/brain.conf`
+3. Default values
+
+Required settings:
+- `MOSAIC_API_URL` - API base URL (default: http://localhost:3001)
+- `MOSAIC_WORKSPACE_ID` - Your workspace UUID
+- `MOSAIC_API_TOKEN` - Authentication token
+
+## Usage from Clawdbot
+
+Natural language examples:
+- "Remember this..." / "Note to self..." → Quick capture
+- "What did I say about..." → Semantic search
+- "Show me my recent ideas" → List ideas
+- "Brain dump: [content]" → Quick capture
+
+## Notes
+
+- Quick capture (`capture`) is fastest - just dump your thought
+- Semantic search (`query`) uses AI to find relevant ideas
+- Regular search is keyword-based, faster but less intelligent
+- Tags are automatically indexed for quick filtering
+- Ideas support markdown formatting in content
diff --git a/packages/skills/brain/brain.sh b/packages/skills/brain/brain.sh
new file mode 100755
index 0000000..cd84d4c
--- /dev/null
+++ b/packages/skills/brain/brain.sh
@@ -0,0 +1,393 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Mosaic Brain CLI - Interface to Mosaic Stack Ideas/Brain API
+# Usage: brain.sh <command> [options]
+
+# Load configuration
+CONFIG_FILE="${HOME}/.config/mosaic/brain.conf"
+if [[ -f "$CONFIG_FILE" ]]; then
+    # shellcheck source=/dev/null
+    source "$CONFIG_FILE"
+fi
+
+# Configuration with defaults
+API_URL="${MOSAIC_API_URL:-http://localhost:3001}"
+WORKSPACE_ID="${MOSAIC_WORKSPACE_ID:-}"
+API_TOKEN="${MOSAIC_API_TOKEN:-}"
+
+# Color output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+# Helper functions
+error() {
+    echo -e "${RED}Error: $1${NC}" >&2
+    exit 1
+}
+
+success() {
+    echo -e "${GREEN}$1${NC}"
+}
+
+warn() {
+    echo -e "${YELLOW}$1${NC}"
+}
+
+check_config() {
+    [[ -z "$WORKSPACE_ID" ]] && error "MOSAIC_WORKSPACE_ID not set"
+    [[ -z "$API_TOKEN" ]] && error "MOSAIC_API_TOKEN not set"
+}
+
+# API call helper
+api_call() {
+    local method="$1"
+    local endpoint="$2"
+    local data="${3:-}"
+    
+    local url="${API_URL}${endpoint}"
+    local args=(
+        -X "$method"
+        -H "Authorization: Bearer ${API_TOKEN}"
+        -H "Content-Type: application/json"
+        -H "x-workspace-id: ${WORKSPACE_ID}"
+        -s
+        -w "\n%{http_code}"
+    )
+    
+    if [[ -n "$data" ]]; then
+        args+=(-d "$data")
+    fi
+    
+    local response
+    response=$(curl "${args[@]}" "$url")
+    
+    # Extract HTTP status code from last line
+    local http_code
+    http_code=$(echo "$response" | tail -n1)
+    local body
+    body=$(echo "$response" | sed '$d')
+    
+    # Check for errors
+    if [[ "$http_code" -ge 400 ]]; then
+        local error_msg
+        error_msg=$(echo "$body" | jq -r '.message // .error // "API request failed"' 2>/dev/null || echo "API request failed")
+        error "HTTP $http_code: $error_msg"
+    fi
+    
+    echo "$body"
+}
+
+# Commands
+
+cmd_capture() {
+    local content=""
+    local title=""
+    
+    while [[ $# -gt 0 ]]; do
+        case $1 in
+            --title)
+                title="$2"
+                shift 2
+                ;;
+            *)
+                content="$1"
+                shift
+                ;;
+        esac
+    done
+    
+    [[ -z "$content" ]] && error "Content required for capture"
+    
+    local payload
+    payload=$(jq -n \
+        --arg content "$content" \
+        --arg title "$title" \
+        '{content: $content} + (if $title != "" then {title: $title} else {} end)')
+    
+    response=$(api_call POST "/api/ideas/capture" "$payload")
+    echo "$response" | jq -r '.id // empty' > /dev/null || error "Failed to capture idea"
+    
+    local idea_id
+    idea_id=$(echo "$response" | jq -r '.id')
+    success "✓ Idea captured: $idea_id"
+    echo "$response" | jq '.'
+}
+
+cmd_create() {
+    local content=""
+    local title=""
+    local tags=""
+    local category=""
+    local status=""
+    local priority=""
+    
+    while [[ $# -gt 0 ]]; do
+        case $1 in
+            --content)
+                content="$2"
+                shift 2
+                ;;
+            --title)
+                title="$2"
+                shift 2
+                ;;
+            --tags)
+                tags="$2"
+                shift 2
+                ;;
+            --category)
+                category="$2"
+                shift 2
+                ;;
+            --status)
+                status="$2"
+                shift 2
+                ;;
+            --priority)
+                priority="$2"
+                shift 2
+                ;;
+            *)
+                content="$1"
+                shift
+                ;;
+        esac
+    done
+    
+    [[ -z "$content" ]] && error "Content required"
+    
+    # Build JSON payload using jq for safety
+    local payload
+    payload=$(jq -n \
+        --arg content "$content" \
+        --arg title "$title" \
+        --arg category "$category" \
+        --arg status "$status" \
+        --arg priority "$priority" \
+        --arg tags "$tags" \
+        '{content: $content} + 
+         (if $title != "" then {title: $title} else {} end) +
+         (if $category != "" then {category: $category} else {} end) +
+         (if $status != "" then {status: $status} else {} end) +
+         (if $priority != "" then {priority: $priority} else {} end) +
+         (if $tags != "" then {tags: ($tags | split(",") | map(gsub("^\\s+|\\s+$";"")))} else {} end)'
+    )
+    
+    response=$(api_call POST "/api/ideas" "$payload")
+    echo "$response" | jq -r '.id // empty' > /dev/null || error "Failed to create idea"
+    
+    local idea_id
+    idea_id=$(echo "$response" | jq -r '.id')
+    success "✓ Idea created: $idea_id"
+    echo "$response" | jq '.'
+}
+
+cmd_list() {
+    local limit="20"
+    local tags=""
+    local status=""
+    
+    while [[ $# -gt 0 ]]; do
+        case $1 in
+            --limit)
+                limit="$2"
+                shift 2
+                ;;
+            --tags)
+                tags="$2"
+                shift 2
+                ;;
+            --status)
+                status="$2"
+                shift 2
+                ;;
+            *)
+                shift
+                ;;
+        esac
+    done
+    
+    local query="?limit=$limit"
+    [[ -n "$tags" ]] && query+="&tags=$tags"
+    [[ -n "$status" ]] && query+="&status=$status"
+    
+    response=$(api_call GET "/api/ideas${query}")
+    echo "$response" | jq '.'
+}
+
+cmd_get() {
+    local idea_id="$1"
+    [[ -z "$idea_id" ]] && error "Idea ID required"
+    
+    response=$(api_call GET "/api/ideas/${idea_id}")
+    echo "$response" | jq '.'
+}
+
+cmd_update() {
+    local idea_id=""
+    local title=""
+    local content=""
+    local tags=""
+    local add_tags=""
+    local remove_tags=""
+    local status=""
+    local category=""
+    
+    idea_id="$1"
+    shift
+    [[ -z "$idea_id" ]] && error "Idea ID required"
+    
+    while [[ $# -gt 0 ]]; do
+        case $1 in
+            --title)
+                title="$2"
+                shift 2
+                ;;
+            --content)
+                content="$2"
+                shift 2
+                ;;
+            --tags)
+                tags="$2"
+                shift 2
+                ;;
+            --add-tags)
+                add_tags="$2"
+                shift 2
+                ;;
+            --remove-tags)
+                remove_tags="$2"
+                shift 2
+                ;;
+            --status)
+                status="$2"
+                shift 2
+                ;;
+            --category)
+                category="$2"
+                shift 2
+                ;;
+            *)
+                shift
+                ;;
+        esac
+    done
+    
+    # Build update payload using jq for safety
+    local payload
+    payload=$(jq -n \
+        --arg title "$title" \
+        --arg content "$content" \
+        --arg status "$status" \
+        --arg category "$category" \
+        --arg tags "$tags" \
+        '(if $title != "" then {title: $title} else {} end) +
+         (if $content != "" then {content: $content} else {} end) +
+         (if $status != "" then {status: $status} else {} end) +
+         (if $category != "" then {category: $category} else {} end) +
+         (if $tags != "" then {tags: ($tags | split(",") | map(gsub("^\\s+|\\s+$";"")))} else {} end)'
+    )
+    
+    response=$(api_call PATCH "/api/ideas/${idea_id}" "$payload")
+    echo "$response" | jq -r '.id // empty' > /dev/null || error "Failed to update idea"
+    
+    success "✓ Idea updated: $idea_id"
+    echo "$response" | jq '.'
+}
+
+cmd_delete() {
+    local idea_id="$1"
+    [[ -z "$idea_id" ]] && error "Idea ID required"
+    
+    response=$(api_call DELETE "/api/ideas/${idea_id}")
+    success "✓ Idea deleted: $idea_id"
+}
+
+cmd_query() {
+    local query="$*"
+    [[ -z "$query" ]] && error "Query text required"
+    
+    local payload
+    payload=$(jq -n --arg query "$query" '{query: $query}')
+    
+    response=$(api_call POST "/api/brain/query" "$payload")
+    echo "$response" | jq '.'
+}
+
+cmd_search() {
+    local search_term=""
+    local limit="20"
+    
+    while [[ $# -gt 0 ]]; do
+        case $1 in
+            --limit)
+                limit="$2"
+                shift 2
+                ;;
+            *)
+                search_term="$1"
+                shift
+                ;;
+        esac
+    done
+    
+    [[ -z "$search_term" ]] && error "Search term required"
+    
+    local query="?q=$(echo "$search_term" | jq -sRr @uri)&limit=$limit"
+    response=$(api_call GET "/api/brain/search${query}")
+    echo "$response" | jq '.'
+}
+
+cmd_tags() {
+    # Get all ideas and extract unique tags
+    response=$(api_call GET "/api/ideas?limit=1000")
+    echo "$response" | jq -r '.data[]?.tags[]? // empty' | sort -u
+}
+
+# Main
+main() {
+    [[ $# -eq 0 ]] && error "Command required. Use: capture, create, list, get, update, delete, query, search, tags"
+    
+    check_config
+    
+    local command="$1"
+    shift
+    
+    case "$command" in
+        capture)
+            cmd_capture "$@"
+            ;;
+        create)
+            cmd_create "$@"
+            ;;
+        list)
+            cmd_list "$@"
+            ;;
+        get)
+            cmd_get "$@"
+            ;;
+        update)
+            cmd_update "$@"
+            ;;
+        delete)
+            cmd_delete "$@"
+            ;;
+        query)
+            cmd_query "$@"
+            ;;
+        search)
+            cmd_search "$@"
+            ;;
+        tags)
+            cmd_tags "$@"
+            ;;
+        *)
+            error "Unknown command: $command"
+            ;;
+    esac
+}
+
+main "$@"