Capabilities Overview

Capabilities are modular units that extend what an agent can do. Each capability can contribute:

Tools — callable functions the agent can invoke during conversations
System prompt additions — context and instructions prepended to the agent’s prompt
Features — UI elements unlocked when the capability is active (e.g., Workspace tab)

Agents compose capabilities — enable only what you need.

Capability Reference

Core

Fundamental capabilities for file operations, command execution, web access, and session management.

Capability	ID	Tools
File System	`session_file_system`	6
Virtual Bash	`virtual_bash`	1
Session	`session`	2
Storage	`session_storage`	2
Web Fetch	`web_fetch`	1
Daytona	`daytona`	9

Data & Productivity

Structured data, time awareness, task tracking, and scheduling.

Capability	ID	Tools
SQL Database	`session_sql_database`	3
Current Time	`current_time`	1
Task Management	`stateless_todo_list`	1
Schedules	`session_schedule`	3

Media

Image generation and editing workflows.

Capability	ID	Tools
OpenAI Image Generation	`gpt_image_gen`	2

Orchestration

Delegate and coordinate work across multiple agent sessions.

Capability	ID	Tools
Sub Agents	`subagents`	3

Integrations

External-service capabilities and blueprint-backed workflows.

Capability	ID	Tools
GitHub Scout	`github_scout`	0

Platform & Configuration

Agent self-management, dynamic instructions, and skill discovery.

Capability	ID	Tools
Platform Management	`platform_management`	14
AGENTS.md	`agent_instructions`	0
Agent Skills	`skills`	2

Optimization

Performance and cost optimization for LLM interactions.

Capability	ID	Tools
Infinity Context	`infinity_context`	1
Auto Tool Search	`auto_tool_search`	1
OpenAI Tool Search	`openai_tool_search`	0
Tool Search	`tool_search`	1
Budgeting	`budgeting`	1
Self-Budget	`self_budget`	0

Safety

Streaming-output guardrails and runtime safety nets.

Capability	ID	Tools
Prompt Canary Guardrail	`prompt_canary_guardrail`	0

Automation

Run shell commands at lifecycle and tool events. Block, mutate, or audit agent actions from outside the model.

Capability	ID	Tools
User Hooks	`user_hooks`	0

Demo

Pre-built domain simulations for testing and demonstrations.

Capability	ID	Tools
Fake Warehouse	`fake_warehouse`	10
Fake AWS	`fake_aws`	11
Fake CRM	`fake_crm`	8

Quick Start

Enable via API

curl -X POST http://localhost:9300/api/v1/agents \
  -H "Content-Type: application/json" \
  -d '{
    "name": "My Agent",
    "system_prompt": "You are a helpful assistant.",
    "capabilities": ["session_file_system", "virtual_bash", "web_fetch"]
  }'

Enable via UI

Navigate to the Agent detail page
Open the Capabilities section
Toggle capabilities on/off
Reorder with drag handles (order affects system prompt priority)
Save

List available capabilities

curl http://localhost:9300/api/v1/capabilities

Create a declarative capability

Declarative capabilities are persisted capability definitions made from data: system prompt text, scoped MCP servers, text file mounts, and skill packages. They use a public resource ID like cap_... and a stable capability reference like declarative:research_pack.

curl -X POST http://localhost:9300/api/v1/capabilities \
  -H "Content-Type: application/json" \
  -d '{
    "definition": {
      "name": "research_pack",
      "display_name": "Research Pack",
      "description": "Default research behavior and resources.",
      "system_prompt": "Prefer primary sources and cite them clearly.",
      "risk_level": "low"
    }
  }'

Agents and harnesses can use the canonical reference:

{ "ref": "declarative:research_pack" }

For convenience, agent and harness write APIs also accept the plain unique name when it matches a declarative capability:

{ "ref": "research_pack" }

Key Concepts

Dependencies

Some capabilities depend on others. Dependencies are resolved automatically at runtime — you don’t need to manually add them.

Capability	Depends On
Virtual Bash	File System
Agent Skills	File System
GitHub Scout	Sub Agents

Features

Capabilities declare UI features they contribute. The session aggregates features from all active capabilities to decide which UI tabs to render.

Feature	UI Element	Contributed By
`file_system`	Workspace tab	File System, Virtual Bash
`secrets`	Storage tab	Storage
`key_value`	Storage tab	Storage
`schedules`	Schedules tab	Schedules
`sql_database`	Database tab	SQL Database
`subagents`	Subagents tab	Sub Agents

Ordering

Capabilities are applied in the order configured on the agent. Earlier capabilities’ system prompt additions appear first. Place the most important context-setting capabilities first.