API Reference

Complete schema reference for Hamr plugin development.

Manifest Schema

The manifest.json file defines your plugin's metadata and capabilities.

Required Fields

Field	Type	Description
name	string	Display name shown in launcher
description	string	Short description
icon	string	Material icon name
supportedPlatforms	array	["niri", "hyprland"], ["macos"], ["windows"], etc. (list all explicitly)

Optional Fields

Field	Type	Default	Description
handler	object	see below	Handler configuration (type, command)
frecency	string	"item"	Usage tracking: "item", "plugin", or "none"
inputMode	string	"realtime"	Default input mode: "realtime" or "submit"
hidden	bool	false	Hide plugin from plugin list (prefix-only access)
staticIndex	array	-	Static index items defined in manifest (see below)
match	object	-	Pattern matching configuration (see below)
matchPattern	string	-	Legacy single regex pattern (use match instead)

Handler Configuration

The handler field specifies how the plugin communicates with hamr:

stdio handler (default):

{
  "handler": {
    "type": "stdio"
  }
}

For stdio plugins, Hamr runs handler.py in the plugin directory by default, so the handler field can be omitted entirely.

socket handler:

{
  "handler": {
    "type": "socket",
    "command": "python3 handler.py"
  }
}

Field	Type	Default	Description
type	string	"stdio"	"stdio" or "socket"
path	string	-	Reserved for stdio handlers; Hamr runs handler.py by default
command	string	-	Command to run the handler (for socket)

Handler Types:

Type	Description	Use Case
stdio	JSON over stdin/stdout, new process per request or daemon loop	Simple plugins, stateless operations
socket	JSON-RPC 2.0 over Unix socket, persistent connection	Complex daemons, real-time updates

Note: For stdio handlers, if daemon.enabled: true, the handler runs as a persistent process reading JSON lines from stdin. For socket handlers, the handler connects to hamr's socket and uses JSON-RPC 2.0.

Daemon Configuration

{
  "daemon": {
    "enabled": true,
    "background": true,
    "restartOnCrash": true,
    "maxRestarts": 5
  }
}

Field	Type	Default	Description
daemon.enabled	bool	false	Enable persistent daemon mode
daemon.background	bool	false	Run always (true) or only when plugin open (false)
daemon.restartOnCrash	bool	false	Automatically restart daemon if it crashes
daemon.maxRestarts	int	0	Maximum restart attempts (0 = unlimited)

Index Configuration

{
  "index": {
    "enabled": true
  }
}

Field	Type	Default	Description
index.enabled	bool	false	Enable main search integration (requires daemon)

Pattern Matching Configuration

{
  "match": {
    "patterns": ["^=", "^[\\d\\.]+\\s*[\\+\\-]"],
    "priority": 100
  }
}

Field	Type	Default	Description
match.patterns	array	-	Regex patterns to trigger instant match
match.priority	number	50	Higher priority wins when multiple plugins match

Static Index Configuration

Define searchable items directly in the manifest without a handler:

{
  "staticIndex": [
    {
      "id": "shutdown",
      "name": "Shutdown",
      "description": "Power off the system",
      "icon": "power_settings_new",
      "keywords": ["power", "off", "halt"],
      "verb": "Execute",
      "entryPoint": {
        "step": "action",
        "selected": { "id": "shutdown" }
      }
    }
  ]
}

Field	Type	Required	Description
id	string	Yes	Unique identifier
name	string	Yes	Display name (searchable)
description	string	No	Subtitle text
icon	string	No	Material icon name
iconType	string	No	"material" (default) or "system"
keywords	array	No	Additional search terms
verb	string	No	Action text (e.g., "Execute")
entryPoint	object	No	Handler invocation data

Complete Manifest Example

Simple stdio plugin:

{
  "name": "My Plugin",
  "description": "What it does",
  "icon": "star",
  "supportedPlatforms": ["niri", "hyprland"],
  "handler": {
    "type": "stdio",
    "path": "handler.py"
  },
  "frecency": "item"
}

Socket-based daemon plugin:

{
  "name": "Timer",
  "description": "Countdown timers",
  "icon": "timer",
  "supportedPlatforms": ["niri", "hyprland", "macos", "windows"],
  "handler": {
    "type": "socket",
    "command": "python3 handler.py"
  },
  "daemon": {
    "enabled": true,
    "background": true,
    "restartOnCrash": true,
    "maxRestarts": 5
  },
  "frecency": "plugin"
}

Pattern-matching plugin:

{
  "name": "Calculate",
  "description": "Calculator",
  "icon": "calculate",
  "supportedPlatforms": ["niri", "hyprland", "macos", "windows"],
  "handler": {
    "type": "stdio",
    "path": "handler.py"
  },
  "match": {
    "patterns": ["^=", "^[\\d\\.]+\\s*[\\+\\-\\*\\/]"],
    "priority": 100
  },
  "frecency": "plugin"
}

---

Request Schema

Every handler invocation receives a JSON object on stdin.

Common Fields

Field	Type	Always Present	Description
step	string	Yes	Request type (see below)
query	string	Yes	Current search bar text
selected	object	No	Selected item info
action	string	No	Action button ID
context	string	No	Plugin state from previous response
session	string	Yes	Unique session identifier

Step Types

Step	When Triggered	Key Fields
initial	Plugin opens	-
search	User types (realtime) or presses Enter (submit)	query
action	User selects item or clicks action	selected, action
match	Pattern matched in main search	query
form	Form submitted	formData
formSlider	Live form slider changed	fieldId, value
poll	Polling tick	query
index	Index request	mode, indexedIds

Request Examples

Initial:

{ "step": "initial", "query": "", "session": "abc123" }

Search:

{ "step": "search", "query": "firefox", "session": "abc123" }

Action (item click):

{ "step": "action", "selected": { "id": "item-1" }, "session": "abc123" }

Action (action button click):

{
  "step": "action",
  "selected": { "id": "item-1" },
  "action": "copy",
  "session": "abc123"
}

Match:

{ "step": "match", "query": "2+2", "session": "abc123" }

Form:

{
  "step": "form",
  "formData": { "title": "Note", "content": "..." },
  "context": "__add__",
  "session": "abc123"
}

Index:

{ "step": "index", "mode": "full", "session": "abc123" }

---

Response Schema

Every response must be a single JSON object with a type field.

Response Types

Type	Purpose
results	Display list of items
execute	Run action and/or close
match	Return pattern match result
card	Display markdown content
form	Show input form
imageBrowser	Image grid browser
gridBrowser	Generic grid layout
prompt	Simple text prompt
update	Patch existing items
index	Provide searchable items
status	Update plugin status
error	Show error message
noop	No UI change

---

Results Response

{
  "type": "results",
  "results": [],
  "placeholder": "Search...",
  "inputMode": "realtime",
  "clearInput": false,
  "context": "",
  "notify": "",
  "pluginActions": [],
  "navigateForward": null,
  "navigateBack": null,
  "navigationDepth": null,
  "status": {}
}

Field	Type	Required	Default	Description
type	string	Yes	-	Must be "results"
results	array	Yes	-	Array of result items
placeholder	string	No	-	Search bar hint text
inputMode	string	No	"realtime"	"realtime" or "submit"
clearInput	bool	No	false	Clear search bar text
context	string	No	-	State persisted across calls
notify	string	No	-	Show notification toast
pluginActions	array	No	[]	Toolbar action buttons
navigateForward	bool	No	-	Increment navigation depth
navigateBack	bool	No	-	Decrement navigation depth
navigationDepth	int	No	-	Set exact navigation depth
status	object	No	-	Plugin status update
activate	bool	No	-	Activate plugin for multi-step flows

Result Item Schema

{
  "id": "unique-id",
  "name": "Display Name",
  "description": "Subtitle text",
  "icon": "star",
  "iconType": "material",
  "thumbnail": "/path/to/image.png",
  "verb": "Open",
  "actions": [],
  "badges": [],
  "chips": [],
  "graph": {},
  "gauge": {},
  "progress": {},
  "preview": {}
}

Field	Type	Required	Default	Description
id	string	Yes	-	Unique identifier
name	string	Yes	-	Primary display text
description	string	No	-	Secondary text
icon	string	No	-	Material icon name
iconType	string	No	"material"	"material", "system", "text", or "path"
thumbnail	string	No	-	Image path (overrides icon)
verb	string	No	-	Action text on hover
actions	array	No	[]	Secondary action buttons (max 4)
badges	array	No	[]	Circular indicators (max 5)
chips	array	No	[]	Pill-shaped tags
graph	object	No	-	Line graph (replaces icon)
gauge	object	No	-	Circular progress (replaces icon)
progress	object	No	-	Progress bar (replaces description)
preview	object	No	-	Side panel content
keepOpen	bool	No	false	Keep launcher open after selection
displayHint	string	No	"auto"	View hint: "auto", "list", "grid", "large_grid"
isSuggestion	bool	No	false	Mark as smart suggestion (shows reason)
suggestionReason	string	No	-	Why this was suggested (e.g., "Often used at 9am")
hasOcr	bool	No	false	Item has OCR-searchable text (images)
keywords	array	No	-	Additional search terms (index items only)
entryPoint	object	No	-	Handler invocation data (index items only)
appId	string	No	-	App ID for window matching (apps only)
appIdFallback	string	No	-	Fallback app ID (apps only)

Slider Item Schema

There are two ways to define sliders:

Simple format (stdio plugins):

{
  "id": "volume",
  "type": "slider",
  "name": "Volume",
  "description": "",
  "icon": "volume_up",
  "value": 75,
  "min": 0,
  "max": 100,
  "step": 5,
  "unit": "%"
}

Extended format (socket plugins with gauge):

{
  "id": "volume",
  "name": "Volume",
  "icon": "volume_up",
  "resultType": "slider",
  "value": {
    "value": 75,
    "min": 0,
    "max": 100,
    "step": 5,
    "displayValue": "75%"
  },
  "gauge": {
    "value": 75,
    "max": 100,
    "label": "75%"
  }
}

Field	Type	Required	Default	Description
id	string	Yes	-	Unique identifier
type	string	No	-	"slider" (simple format)
resultType	string	No	-	"slider" (extended format)
name	string	Yes	-	Label text
description	string	No	-	Subtitle
icon	string	No	-	Material icon
value	number/object	Yes	-	Current value or value object
min	number	No	0	Minimum value (simple format)
max	number	No	100	Maximum value (simple format)
step	number	No	1	Step increment (simple format)
unit	string	No	-	Unit suffix (simple format)
gauge	object	No	-	Gauge display (extended format)

Switch Item Schema

There are two ways to define switches:

Simple format (stdio plugins):

{
  "id": "mute",
  "type": "switch",
  "name": "Mute",
  "description": "",
  "icon": "volume_off",
  "value": false
}

Extended format (socket plugins):

{
  "id": "volume-mute",
  "name": "Mute Volume",
  "description": "Mute system audio output",
  "icon": "volume_up",
  "resultType": "switch",
  "value": false
}

Field	Type	Required	Default	Description
id	string	Yes	-	Unique identifier
type	string	No	-	"switch" (simple format)
resultType	string	No	-	"switch" (extended format)
name	string	Yes	-	Label text
description	string	No	-	Subtitle
icon	string	No	-	Material icon
value	bool	Yes	-	Current state

Action Button Schema

{
  "id": "copy",
  "name": "Copy",
  "icon": "content_copy",
  "entryPoint": {}
}

Field	Type	Required	Description
id	string	Yes	Action identifier
name	string	Yes	Button label/tooltip
icon	string	No	Material icon
entryPoint	object	No	For indexed items only

Plugin Action Schema

{
  "id": "add",
  "name": "Add",
  "icon": "add_circle",
  "shortcut": "Ctrl+1",
  "confirm": "Are you sure?",
  "active": false
}

Field	Type	Required	Default	Description
id	string	Yes	-	Action identifier
name	string	Yes	-	Button label
icon	string	No	-	Material icon
shortcut	string	No	"Ctrl+N"	Keyboard shortcut hint
confirm	string	No	-	Confirmation dialog message
active	bool	No	false	Highlight as active

Badge Schema

{
  "text": "5",
  "icon": "star",
  "image": "/path/to/avatar.png",
  "color": "#ffffff"
}

Field	Type	Required	Description
text	string	No	1-3 character text
icon	string	No	Material icon (overrides text)
image	string	No	Image path (overrides text/icon)
color	string	No	Text/icon color

Chip Schema

{
  "text": "Label",
  "icon": "tag",
  "color": "#ffffff",
  "background": "#4caf50"
}

Field	Type	Required	Description
text	string	Yes	Chip text
icon	string	No	Material icon
color	string	No	Text/icon color
background	string	No	Background color

Graph Schema

{
  "values": [10, 25, 15, 30, 20],
  "color": "#4caf50",
  "max": 100
}

Field	Type	Required	Default	Description
values	array	Yes	-	Array of numbers
color	string	No	theme	Line color
max	number	No	auto	Maximum Y value

Gauge Schema

{
  "value": 75,
  "max": 100,
  "label": "75%",
  "color": "#4caf50"
}

Field	Type	Required	Default	Description
value	number	Yes	-	Current value
max	number	No	100	Maximum value
label	string	No	-	Center label
color	string	No	theme	Arc color

Progress Schema

{
  "value": 50,
  "max": 100,
  "label": "Downloading...",
  "color": "#2196f3"
}

Field	Type	Required	Default	Description
value	number	Yes	-	Current value
max	number	No	100	Maximum value
label	string	No	-	Text label
color	string	No	theme	Bar color

Preview Schema

{
  "type": "markdown",
  "content": "# Preview\n\nContent here...",
  "detached": false
}

Field	Type	Required	Description
type	string	Yes	"markdown", "image", or "code"
content	string	Yes	Preview content
detached	bool	No	Show as floating panel
language	string	No	Code language (for "code" type)

---

Execute Response

{
  "type": "execute",
  "launch": "/path/to/app.desktop",
  "copy": "text to copy",
  "typeText": "text to type",
  "openUrl": "https://example.com",
  "open": "/path/to/file",
  "notify": "Done!",
  "sound": "complete",
  "close": true
}

Field	Type	Required	Description
type	string	Yes	Must be "execute"
launch	string	No	Desktop file path
copy	string	No	Text to copy to clipboard
typeText	string	No	Text to type via ydotool
openUrl	string	No	URL to open
open	string	No	File/folder path to open
notify	string	No	Notification message
sound	string	No	Sound effect name
close	bool	No	Close launcher

Sound Names

Sound	Description
alarm	Timer/alarm completion
timer	Pomodoro, countdown
complete	Task done
notification	Alerts
error	Failed operations
warning	Caution alerts

---

Match Response

{
  "type": "match",
  "result": {
    "id": "calc_result",
    "name": "4",
    "description": "2+2",
    "icon": "calculate",
    "verb": "Copy",
    "copy": "4",
    "openUrl": "",
    "notify": "Copied: 4",
    "close": true,
    "priority": 100,
    "actions": []
  }
}

Field	Type	Required	Description
type	string	Yes	Must be "match"
result	object/null	Yes	Match result or null to hide

Match Result Fields

Field	Type	Required	Description
id	string	Yes	Unique identifier
name	string	Yes	Primary text (the result)
description	string	No	Secondary text (the input)
icon	string	No	Material icon
verb	string	No	Action text
copy	string	No	Copy on selection
openUrl	string	No	Open URL on selection
notify	string	No	Notification after action
close	bool	No	Close launcher
priority	number	No	Ranking priority
actions	array	No	Secondary action buttons

---

Card Response

{
  "type": "card",
  "card": {
    "title": "Definition",
    "content": "**noun**\n\nMeaning...",
    "markdown": true,
    "actions": []
  },
  "context": "word-id",
  "inputMode": "submit",
  "placeholder": "Type reply..."
}

Field	Type	Required	Description
type	string	Yes	Must be "card"
card	object	Yes	Card content
context	string	No	State for action handling
inputMode	string	No	"realtime" or "submit"
placeholder	string	No	Input hint

Card Object Fields

Field	Type	Required	Description
title	string	No	Card title
content	string	Yes	Card content
markdown	bool	No	Render as markdown
actions	array	No	Action buttons

---

Form Response

{
  "type": "form",
  "form": {
    "title": "Add Item",
    "submitLabel": "Save",
    "cancelLabel": "Cancel",
    "liveUpdate": false,
    "fields": []
  },
  "context": "__add__"
}

Field	Type	Required	Description
type	string	Yes	Must be "form"
form	object	Yes	Form definition
context	string	No	State passed to submission

Form Object Fields

Field	Type	Required	Default	Description
title	string	No	-	Form title
submitLabel	string	No	"Submit"	Submit button text
cancelLabel	string	No	"Cancel"	Cancel button text
liveUpdate	bool	No	false	Apply changes immediately
fields	array	Yes	-	Form field definitions

Form Field Types

Text Field

{
  "id": "name",
  "type": "text",
  "label": "Name",
  "placeholder": "Enter name...",
  "required": true,
  "default": "",
  "hint": "Helper text"
}

Textarea Field

{
  "id": "content",
  "type": "textarea",
  "label": "Content",
  "placeholder": "",
  "required": false,
  "default": "",
  "rows": 6,
  "hint": ""
}

Email Field

{
  "id": "email",
  "type": "email",
  "label": "Email",
  "placeholder": "user@example.com",
  "required": true,
  "default": "",
  "hint": ""
}

Password Field

{
  "id": "password",
  "type": "password",
  "label": "Password",
  "placeholder": "",
  "required": true,
  "hint": ""
}

Hidden Field

{
  "id": "item_id",
  "type": "hidden",
  "value": "abc123"
}

Select Field

{
  "id": "theme",
  "type": "select",
  "label": "Theme",
  "options": [
    { "id": "light", "name": "Light" },
    { "id": "dark", "name": "Dark" }
  ],
  "default": "dark",
  "hint": ""
}

Checkbox Field

{
  "id": "agree",
  "type": "checkbox",
  "label": "I agree to terms",
  "default": false,
  "hint": ""
}

Switch Field

{
  "id": "enabled",
  "type": "switch",
  "label": "Enabled",
  "default": true,
  "hint": ""
}

Slider Field

{
  "id": "volume",
  "type": "slider",
  "label": "Volume",
  "min": 0,
  "max": 100,
  "step": 5,
  "unit": "%",
  "default": 50,
  "hint": ""
}

Form Field Common Properties

Field	Type	Required	Description
id	string	Yes	Field identifier
type	string	Yes	Field type
label	string	No	Display label
required	bool	No	Validation
default	varies	No	Default value
hint	string	No	Helper text

---

Image Browser Response

{
  "type": "imageBrowser",
  "imageBrowser": {
    "directory": "~/Pictures",
    "title": "Select Image",
    "enableOcr": false,
    "actions": []
  }
}

Field	Type	Required	Description
directory	string	Yes	Directory to browse
title	string	No	Browser title
enableOcr	bool	No	Enable OCR text search
actions	array	No	Action buttons

---

Grid Browser Response

{
  "type": "gridBrowser",
  "gridBrowser": {
    "title": "Select Item",
    "columns": 8,
    "cellAspectRatio": 1.0,
    "items": [],
    "actions": []
  }
}

Field	Type	Required	Default	Description
title	string	No	-	Browser title
columns	int	No	8	Number of columns
cellAspectRatio	float	No	1.0	Width/height ratio
items	array	Yes	-	Grid items
actions	array	No	[]	Action buttons

Grid Item Schema

{
  "id": "item-1",
  "name": "Item Name",
  "icon": "star",
  "iconType": "material",
  "keywords": ["search", "terms"]
}

---

Index Response

{
  "type": "index",
  "mode": "full",
  "items": [],
  "remove": []
}

Field	Type	Required	Description
type	string	Yes	Must be "index"
mode	string	No	"full" or "incremental"
items	array	Yes	Items to index
remove	array	No	Item IDs to remove (incremental)

Index Item Schema

{
  "id": "app:firefox",
  "name": "Firefox",
  "description": "Web Browser",
  "icon": "firefox",
  "iconType": "system",
  "keywords": ["browser", "web"],
  "verb": "Open",
  "entryPoint": {
    "step": "action",
    "selected": { "id": "app:firefox" }
  },
  "actions": []
}

Field	Type	Required	Description
id	string	Yes	Unique identifier
name	string	Yes	Display name (searchable)
description	string	No	Subtitle
icon	string	No	Icon name
iconType	string	No	"material" or "system"
keywords	array	No	Additional search terms
verb	string	No	Action text
entryPoint	object	Yes	How to invoke handler
actions	array	No	Secondary actions

Entry Point Schema

{
  "step": "action",
  "selected": { "id": "item-id" },
  "action": "copy",
  "query": ""
}

Field	Type	Required	Default	Description
step	string	No	"action"	Step type
selected	object	No	-	Selected item info
action	string	No	-	Action to perform
query	string	No	-	Query string

---

Status Response

{
  "type": "status",
  "status": {
    "badges": [],
    "chips": [],
    "description": "5 pending tasks",
    "fab": {},
    "ambient": []
  }
}

Field	Type	Description
badges	array	Badge indicators
chips	array	Chip tags
description	string	Override manifest description
fab	object	FAB override (see below)
ambient	array	Ambient items (see below)

FAB Override Schema

{
  "chips": [{ "text": "04:32", "icon": "timer" }],
  "badges": [],
  "priority": 10,
  "showFab": true
}

Field	Type	Description
chips	array	Chip widgets
badges	array	Badge widgets
priority	number	Higher wins if multiple
showFab	bool	Force FAB visible

Ambient Item Schema

{
  "id": "timer-1",
  "name": "Focus Timer",
  "description": "24:32 remaining",
  "icon": "timer",
  "actions": [{ "id": "pause", "icon": "pause", "name": "Pause" }],
  "duration": 0
}

Field	Type	Description
id	string	Unique identifier
name	string	Primary text
description	string	Secondary text
icon	string	Material icon
actions	array	Action buttons
duration	number	Auto-dismiss ms (0 = permanent)

---

Update Response

{
  "type": "update",
  "items": [
    {
      "id": "volume",
      "gauge": { "value": 75, "max": 100 }
    }
  ]
}

Field	Type	Required	Description
type	string	Yes	Must be "update"
items	array	Yes	Partial item updates

---

Error Response

{
  "type": "error",
  "message": "Failed to connect"
}

Field	Type	Required	Description
type	string	Yes	Must be "error"
message	string	Yes	Error message

---

Noop Response

{
  "type": "noop"
}

No UI change. Use for background operations or when UI already reflects the change (e.g., slider adjustments).

---

Prompt Response

{
  "type": "prompt",
  "prompt": {
    "text": "Enter search term..."
  }
}

Field	Type	Required	Description
type	string	Yes	Must be "prompt"
prompt.text	string	Yes	Prompt message

---

Special IDs

ID	Context	Meaning
__back__	selected.id	Back button/Escape pressed
__plugin__	selected.id	Plugin action clicked
__form_cancel__	selected.id	Form cancelled
__empty__	selected.id	Non-actionable placeholder
__dismiss__	action	Ambient item dismissed