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hermes-agent/website/docs/reference/tools-reference.md
Teknium b07791db05
feat(computer-use): cua-driver backend, universal any-model schema 
Background macOS desktop control via cua-driver MCP — does NOT steal the
user's cursor or keyboard focus, works with any tool-capable model.

Replaces the Anthropic-native `computer_20251124` approach from the
abandoned #4562 with a generic OpenAI function-calling schema plus SOM
(set-of-mark) captures so Claude, GPT, Gemini, and open models can all
drive the desktop via numbered element indices.

## What this adds

- `tools/computer_use/` package — swappable ComputerUseBackend ABC +
  CuaDriverBackend (stdio MCP client to trycua/cua's cua-driver binary).
- Universal `computer_use` tool with one schema for all providers.
  Actions: capture (som/vision/ax), click, double_click, right_click,
  middle_click, drag, scroll, type, key, wait, list_apps, focus_app.
- Multimodal tool-result envelope (`_multimodal=True`, OpenAI-style
  `content: [text, image_url]` parts) that flows through
  handle_function_call into the tool message. Anthropic adapter converts
  into native `tool_result` image blocks; OpenAI-compatible providers
  get the parts list directly.
- Image eviction in convert_messages_to_anthropic: only the 3 most
  recent screenshots carry real image data; older ones become text
  placeholders to cap per-turn token cost.
- Context compressor image pruning: old multimodal tool results have
  their image parts stripped instead of being skipped.
- Image-aware token estimation: each image counts as a flat 1500 tokens
  instead of its base64 char length (~1MB would have registered as
  ~250K tokens before).
- COMPUTER_USE_GUIDANCE system-prompt block — injected when the toolset
  is active.
- Session DB persistence strips base64 from multimodal tool messages.
- Trajectory saver normalises multimodal messages to text-only.
- `hermes tools` post-setup installs cua-driver via the upstream script
  and prints permission-grant instructions.
- CLI approval callback wired so destructive computer_use actions go
  through the same prompt_toolkit approval dialog as terminal commands.
- Hard safety guards at the tool level: blocked type patterns
  (curl|bash, sudo rm -rf, fork bomb), blocked key combos (empty trash,
  force delete, lock screen, log out).
- Skill `apple/macos-computer-use/SKILL.md` — universal (model-agnostic)
  workflow guide.
- Docs: `user-guide/features/computer-use.md` plus reference catalog
  entries.

## Tests

44 new tests in tests/tools/test_computer_use.py covering schema
shape (universal, not Anthropic-native), dispatch routing, safety
guards, multimodal envelope, Anthropic adapter conversion, screenshot
eviction, context compressor pruning, image-aware token estimation,
run_agent helpers, and universality guarantees.

469/469 pass across tests/tools/test_computer_use.py + the affected
agent/ test suites.

## Not in this PR

- `model_tools.py` provider-gating: the tool is available to every
  provider. Providers without multi-part tool message support will see
  text-only tool results (graceful degradation via `text_summary`).
- Anthropic server-side `clear_tool_uses_20250919` — deferred;
  client-side eviction + compressor pruning cover the same cost ceiling
  without a beta header.

## Caveats

- macOS only. cua-driver uses private SkyLight SPIs
  (SLEventPostToPid, SLPSPostEventRecordTo,
  _AXObserverAddNotificationAndCheckRemote) that can break on any macOS
  update. Pin with HERMES_CUA_DRIVER_VERSION.
- Requires Accessibility + Screen Recording permissions — the post-setup
  prints the Settings path.

Supersedes PR #4562 (pyautogui/Quartz foreground backend, Anthropic-
native schema). Credit @0xbyt4 for the original #3816 groundwork whose
context/eviction/token design is preserved here in generic form.
2026-04-23 16:44:24 -07:00

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---
sidebar_position: 3
title: "Built-in Tools Reference"
description: "Authoritative reference for Hermes built-in tools, grouped by toolset"
---
# Built-in Tools Reference
This page documents all 53 built-in tools in the Hermes tool registry, grouped by toolset. Availability varies by platform, credentials, and enabled toolsets.
**Quick counts:** 11 browser tools, 4 file tools, 10 RL tools, 4 Home Assistant tools, 2 terminal tools, 2 web tools, 5 Feishu tools, and 15 standalone tools across other toolsets.
:::tip MCP Tools
In addition to built-in tools, Hermes can load tools dynamically from MCP servers. MCP tools appear with a server-name prefix (e.g., `github_create_issue` for the `github` MCP server). See [MCP Integration](/docs/user-guide/features/mcp) for configuration.
:::
## `browser` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `browser_back` | Navigate back to the previous page in browser history. Requires browser_navigate to be called first. | — |
| `browser_cdp` | Send a raw Chrome DevTools Protocol (CDP) command. Escape hatch for browser operations not covered by browser_navigate, browser_click, browser_console, etc. Only available when a CDP endpoint is reachable at session start — via `/browser connect` or `browser.cdp_url` config. See https://chromedevtools.github.io/devtools-protocol/ | — |
| `browser_click` | Click on an element identified by its ref ID from the snapshot (e.g., '@e5'). The ref IDs are shown in square brackets in the snapshot output. Requires browser_navigate and browser_snapshot to be called first. | — |
| `browser_console` | Get browser console output and JavaScript errors from the current page. Returns console.log/warn/error/info messages and uncaught JS exceptions. Use this to detect silent JavaScript errors, failed API calls, and application warnings. Requi… | — |
| `browser_get_images` | Get a list of all images on the current page with their URLs and alt text. Useful for finding images to analyze with the vision tool. Requires browser_navigate to be called first. | — |
| `browser_navigate` | Navigate to a URL in the browser. Initializes the session and loads the page. Must be called before other browser tools. For simple information retrieval, prefer web_search or web_extract (faster, cheaper). Use browser tools when you need… | — |
| `browser_press` | Press a keyboard key. Useful for submitting forms (Enter), navigating (Tab), or keyboard shortcuts. Requires browser_navigate to be called first. | — |
| `browser_scroll` | Scroll the page in a direction. Use this to reveal more content that may be below or above the current viewport. Requires browser_navigate to be called first. | — |
| `browser_snapshot` | Get a text-based snapshot of the current page's accessibility tree. Returns interactive elements with ref IDs (like @e1, @e2) for browser_click and browser_type. full=false (default): compact view with interactive elements. full=true: comp… | — |
| `browser_type` | Type text into an input field identified by its ref ID. Clears the field first, then types the new text. Requires browser_navigate and browser_snapshot to be called first. | — |
| `browser_vision` | Take a screenshot of the current page and analyze it with vision AI. Use this when you need to visually understand what's on the page - especially useful for CAPTCHAs, visual verification challenges, complex layouts, or when the text snaps… | — |
## `clarify` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `clarify` | Ask the user a question when you need clarification, feedback, or a decision before proceeding. Supports two modes: 1. **Multiple choice** — provide up to 4 choices. The user picks one or types their own answer via a 5th 'Other' option. 2.… | — |
## `code_execution` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `execute_code` | Run a Python script that can call Hermes tools programmatically. Use this when you need 3+ tool calls with processing logic between them, need to filter/reduce large tool outputs before they enter your context, need conditional branching (… | — |
## `cronjob` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `cronjob` | Unified scheduled-task manager. Use `action="create"`, `"list"`, `"update"`, `"pause"`, `"resume"`, `"run"`, or `"remove"` to manage jobs. Supports skill-backed jobs with one or more attached skills, and `skills=[]` on update clears attached skills. Cron runs happen in fresh sessions with no current-chat context. | — |
## `delegation` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `delegate_task` | Spawn one or more subagents to work on tasks in isolated contexts. Each subagent gets its own conversation, terminal session, and toolset. Only the final summary is returned -- intermediate tool results never enter your context window. TWO… | — |
## `feishu_doc` toolset
Scoped to the Feishu document-comment intelligent-reply handler (`gateway/platforms/feishu_comment.py`). Not exposed on `hermes-cli` or the regular Feishu chat adapter.
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `feishu_doc_read` | Read the full text content of a Feishu/Lark document (Docx, Doc, or Sheet) given its file_type and token. | Feishu app credentials |
## `feishu_drive` toolset
Scoped to the Feishu document-comment handler. Drives comment read/write operations on drive files.
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `feishu_drive_add_comment` | Add a top-level comment on a Feishu/Lark document or file. | Feishu app credentials |
| `feishu_drive_list_comments` | List whole-document comments on a Feishu/Lark file, most recent first. | Feishu app credentials |
| `feishu_drive_list_comment_replies` | List replies on a specific Feishu comment thread (whole-doc or local-selection). | Feishu app credentials |
| `feishu_drive_reply_comment` | Post a reply on a Feishu comment thread, with optional `@`-mention. | Feishu app credentials |
## `file` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `patch` | Targeted find-and-replace edits in files. Use this instead of sed/awk in terminal. Uses fuzzy matching (9 strategies) so minor whitespace/indentation differences won't break it. Returns a unified diff. Auto-runs syntax checks after editing… | — |
| `read_file` | Read a text file with line numbers and pagination. Use this instead of cat/head/tail in terminal. Output format: 'LINE_NUM\|CONTENT'. Suggests similar filenames if not found. Use offset and limit for large files. NOTE: Cannot read images o… | — |
| `search_files` | Search file contents or find files by name. Use this instead of grep/rg/find/ls in terminal. Ripgrep-backed, faster than shell equivalents. Content search (target='content'): Regex search inside files. Output modes: full matches with line… | — |
| `write_file` | Write content to a file, completely replacing existing content. Use this instead of echo/cat heredoc in terminal. Creates parent directories automatically. OVERWRITES the entire file — use 'patch' for targeted edits. | — |
## `homeassistant` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `ha_call_service` | Call a Home Assistant service to control a device. Use ha_list_services to discover available services and their parameters for each domain. | — |
| `ha_get_state` | Get the detailed state of a single Home Assistant entity, including all attributes (brightness, color, temperature setpoint, sensor readings, etc.). | — |
| `ha_list_entities` | List Home Assistant entities. Optionally filter by domain (light, switch, climate, sensor, binary_sensor, cover, fan, etc.) or by area name (living room, kitchen, bedroom, etc.). | — |
| `ha_list_services` | List available Home Assistant services (actions) for device control. Shows what actions can be performed on each device type and what parameters they accept. Use this to discover how to control devices found via ha_list_entities. | — |
## `computer_use` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `computer_use` | Background macOS desktop control via cua-driver — screenshots (SOM / vision / AX), click / drag / scroll / type / key / wait, list_apps, focus_app. Does NOT steal the user's cursor or keyboard focus. Works with any tool-capable model. macOS only. | `cua-driver` on `$PATH` (install via `hermes tools`). |
:::note
**Honcho tools** (`honcho_profile`, `honcho_search`, `honcho_context`, `honcho_reasoning`, `honcho_conclude`) are no longer built-in. They are available via the Honcho memory provider plugin at `plugins/memory/honcho/`. See [Memory Providers](../user-guide/features/memory-providers.md) for installation and usage.
:::
## `image_gen` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `image_generate` | Generate high-quality images from text prompts using FAL.ai. The underlying model is user-configured (default: FLUX 2 Klein 9B, sub-1s generation) and is not selectable by the agent. Returns a single image URL. Display it using… | FAL_KEY |
## `memory` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `memory` | Save important information to persistent memory that survives across sessions. Your memory appears in your system prompt at session start -- it's how you remember things about the user and your environment between conversations. WHEN TO SA… | — |
## `messaging` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `send_message` | Send a message to a connected messaging platform, or list available targets. IMPORTANT: When the user asks to send to a specific channel or person (not just a bare platform name), call send_message(action='list') FIRST to see available tar… | — |
## `moa` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `mixture_of_agents` | Route a hard problem through multiple frontier LLMs collaboratively. Makes 5 API calls (4 reference models + 1 aggregator) with maximum reasoning effort — use sparingly for genuinely difficult problems. Best for: complex math, advanced alg… | OPENROUTER_API_KEY |
## `rl` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `rl_check_status` | Get status and metrics for a training run. RATE LIMITED: enforces 30-minute minimum between checks for the same run. Returns WandB metrics: step, state, reward_mean, loss, percent_correct. | TINKER_API_KEY, WANDB_API_KEY |
| `rl_edit_config` | Update a configuration field. Use rl_get_current_config() first to see all available fields for the selected environment. Each environment has different configurable options. Infrastructure settings (tokenizer, URLs, lora_rank, learning_ra… | TINKER_API_KEY, WANDB_API_KEY |
| `rl_get_current_config` | Get the current environment configuration. Returns only fields that can be modified: group_size, max_token_length, total_steps, steps_per_eval, use_wandb, wandb_name, max_num_workers. | TINKER_API_KEY, WANDB_API_KEY |
| `rl_get_results` | Get final results and metrics for a completed training run. Returns final metrics and path to trained weights. | TINKER_API_KEY, WANDB_API_KEY |
| `rl_list_environments` | List all available RL environments. Returns environment names, paths, and descriptions. TIP: Read the file_path with file tools to understand how each environment works (verifiers, data loading, rewards). | TINKER_API_KEY, WANDB_API_KEY |
| `rl_list_runs` | List all training runs (active and completed) with their status. | TINKER_API_KEY, WANDB_API_KEY |
| `rl_select_environment` | Select an RL environment for training. Loads the environment's default configuration. After selecting, use rl_get_current_config() to see settings and rl_edit_config() to modify them. | TINKER_API_KEY, WANDB_API_KEY |
| `rl_start_training` | Start a new RL training run with the current environment and config. Most training parameters (lora_rank, learning_rate, etc.) are fixed. Use rl_edit_config() to set group_size, batch_size, wandb_project before starting. WARNING: Training… | TINKER_API_KEY, WANDB_API_KEY |
| `rl_stop_training` | Stop a running training job. Use if metrics look bad, training is stagnant, or you want to try different settings. | TINKER_API_KEY, WANDB_API_KEY |
| `rl_test_inference` | Quick inference test for any environment. Runs a few steps of inference + scoring using OpenRouter. Default: 3 steps x 16 completions = 48 rollouts per model, testing 3 models = 144 total. Tests environment loading, prompt construction, in… | TINKER_API_KEY, WANDB_API_KEY |
## `session_search` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `session_search` | Search your long-term memory of past conversations. This is your recall -- every past session is searchable, and this tool summarizes what happened. USE THIS PROACTIVELY when: - The user says 'we did this before', 'remember when', 'last ti… | — |
## `skills` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `skill_manage` | Manage skills (create, update, delete). Skills are your procedural memory — reusable approaches for recurring task types. New skills go to ~/.hermes/skills/; existing skills can be modified wherever they live. Actions: create (full SKILL.m… | — |
| `skill_view` | Skills allow for loading information about specific tasks and workflows, as well as scripts and templates. Load a skill's full content or access its linked files (references, templates, scripts). First call returns SKILL.md content plus a… | — |
| `skills_list` | List available skills (name + description). Use skill_view(name) to load full content. | — |
## `terminal` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `process` | Manage background processes started with terminal(background=true). Actions: 'list' (show all), 'poll' (check status + new output), 'log' (full output with pagination), 'wait' (block until done or timeout), 'kill' (terminate), 'write' (sen… | — |
| `terminal` | Execute shell commands on a Linux environment. Filesystem persists between calls. Set `background=true` for long-running servers. Set `notify_on_complete=true` (with `background=true`) to get an automatic notification when the process finishes — no polling needed. Do NOT use cat/head/tail — use read_file. Do NOT use grep/rg/find — use search_files. | — |
## `todo` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `todo` | Manage your task list for the current session. Use for complex tasks with 3+ steps or when the user provides multiple tasks. Call with no parameters to read the current list. Writing: - Provide 'todos' array to create/update items - merge=… | — |
## `vision` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `vision_analyze` | Analyze images using AI vision. Provides a comprehensive description and answers a specific question about the image content. | — |
## `web` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `web_search` | Search the web for information on any topic. Returns up to 5 relevant results with titles, URLs, and descriptions. | EXA_API_KEY or PARALLEL_API_KEY or FIRECRAWL_API_KEY or TAVILY_API_KEY |
| `web_extract` | Extract content from web page URLs. Returns page content in markdown format. Also works with PDF URLs — pass the PDF link directly and it converts to markdown text. Pages under 5000 chars return full markdown; larger pages are LLM-summarized. | EXA_API_KEY or PARALLEL_API_KEY or FIRECRAWL_API_KEY or TAVILY_API_KEY |
## `tts` toolset
| Tool | Description | Requires environment |
|------|-------------|----------------------|
| `text_to_speech` | Convert text to speech audio. Returns a MEDIA: path that the platform delivers as a voice message. On Telegram it plays as a voice bubble, on Discord/WhatsApp as an audio attachment. In CLI mode, saves to ~/voice-memos/. Voice and provider… | — |
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