Factsets
A self-maintaining knowledge base for AI agents, exposed via the
Model Context Protocol (MCP). Manages facts (atomic knowledge), resources
(cached external content), skills (procedural markdown), and execution logs (command history) using SQLite.
Features
- Persistent Context - Knowledge survives across sessions
- Self-Maintaining - Staleness detection with refresh instructions
- Tag-Based Organization - Flexible categorization and retrieval
- Skill Documents - Markdown files for procedural knowledge
- User Preferences - Configurable output style and agent behavior
- MCP Protocol - Standard interface for AI tool/prompt definitions
Installation
npm install --global factsets
pnpm install --global factsets
bun install --global factsets
Quick Start
As MCP Server
Add to your MCP client configuration (Claude Desktop, GitHub Copilot, Cursor, etc.), using bunx, npx or pnpm dlx accordingly:
{
"mcpServers": {
"factsets": {
"command": "bunx",
"args": ["factsets", "mcp-server"]
}
}
}
Or run directly:
First-Time Setup
After adding Factsets to your MCP client, run the setup prompt to integrate it into your project:
In a supported IDE: Type /mcp.factsets.setup in the chat to run the guided setup
In other clients: Call the get_setup_guide tool or use the setup prompt
The setup guide will:
- Analyze your project structure and establish baseline facts
- Configure the skills directory for your AI client
- Create or update
AGENTS.md with Factsets instructions
- Migrate any existing skills with Factsets integration
- Register key configuration files as resources
This one-time setup ensures agents have full context on every future interaction.
CLI Commands
bunx factsets [--database-url <path>] [--client <type>]
bunx factsets mcp-server [--database-url <path>] [--client <type>]
bunx factsets --no-watch-skills
bunx factsets --no-seed
bunx factsets watch-files [--database-url <path>]
bunx factsets worker [--database-url <path>]
bunx factsets dump backup.json
bunx factsets restore backup.json
The --client flag configures where skill files are stored (e.g., github-copilot -> .github/prompts/skills/). If you want to change clients / your skill directory, do so through your agent which will migrate skills for you.
See Configuration Guide for all options.
Core Concepts
| Concept | Description |
|---|
| Facts | Atomic knowledge units (1-3 sentences), tagged and timestamped |
| Resources | External content (files, URLs, APIs) with cached snapshots and retrieval methods |
| Skills | Markdown documents for procedural knowledge, stored on filesystem |
| Execution Logs | Command history with success/failure tracking for skill validation |
| Tags | Flexible categorization for all content types |
Facts
| Tool | Description |
|---|
submit_facts | Add facts with tags and source tracking |
search_facts | Query facts by tags, content, or filters |
verify_facts | Mark facts as verified by ID |
verify_facts_by_tags | Bulk verify facts by tags |
update_fact | Update fact content, metadata, or tags |
delete_facts | Remove facts by criteria |
restore_facts | Restore soft-deleted facts |
Resources
| Tool | Description |
|---|
add_resources | Register resources with retrieval methods |
search_resources | Find resources by tags, type, or URI |
get_resources | Get resources by ID or URI with freshness |
update_resource_snapshot | Update cached content for single resource |
update_resource_snapshots | Bulk update cached content |
update_resource | Update resource metadata (not content) |
delete_resources | Remove resources |
restore_resources | Restore soft-deleted resources |
Skills
| Tool | Description |
|---|
create_skill | Create markdown skill document |
update_skill | Update skill metadata/references |
search_skills | Find skills by tags or query |
get_skills | Get skills by name with content |
link_skill | Link skill to facts/resources/skills |
sync_skill | Sync skill after file edit |
delete_skills | Remove skills |
get_dependency_graph | Get skill dependency tree |
restore_skills | Restore soft-deleted skills |
Execution Logs
| Tool | Description |
|---|
submit_execution_logs | Record command/test/build executions |
search_execution_logs | Find executions by query, tags, success |
get_execution_log | Get execution details by ID |
| Tool | Description |
|---|
create_tags | Create organizational tags |
list_tags | List tags with usage counts |
update_tags | Update tag descriptions |
prune_orphan_tags | Clean up unused orphan tags |
Configuration
| Tool | Description |
|---|
get_config | Get a configuration value by key |
set_config | Set a configuration value |
delete_config | Delete a configuration value |
list_config | List all configuration with schema |
get_config_schema | Get available options with descriptions |
User Preferences
| Tool | Description |
|---|
get_preference_prompt | Get natural language preference prompt |
get_user_preferences | Get structured preference data |
infer_preference | Update preference from user behavior |
reset_preferences | Reset preferences to defaults |
Maintenance
| Tool | Description |
|---|
check_stale | Find stale resources and dependencies |
mark_resources_refreshed | Mark resources as current |
Context & Guides
| Tool | Description |
|---|
get_knowledge_context | Build context from tags (facts/resources/skills) |
build_skill_context | Get skill with formatted content and refs |
get_maintenance_report | Generate staleness/maintenance report |
get_refresh_guide | Get instructions for refreshing a resource |
get_agent_guide | Get the agent workflow guide (call first) |
get_concept_guide | Get conceptual overview and design philosophy |
get_config_guide | Get configuration guide with all options |
MCP Prompts
| Prompt | Description |
|---|
setup | Guided setup for new project integration |
user_preferences | Get user preferences for output formatting |
knowledge_context | Build context from tags |
recall_skill | Get skill with references |
maintenance_report | Staleness summary |
refresh_guide | Instructions to refresh a resource |
agent_guide | Agent workflow guide (call first) |
concept | Conceptual overview and philosophy |
config | Configuration guide with all options |
Documentation
Development
bun test
bun e2e
bun dist
bun format
bun lint
bun migrations
bun inspect
