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StartupAPI exposes Pterodactyl’s startup variable endpoints. It is available as panel.startup on every Panel instance and allows you to read and modify the environment variables that are injected into a server’s startup command — for example, the server version, maximum players, or any other egg-defined variable. Changes made via update() take effect the next time the server starts. All methods accept server_id as their first argument and return a raw requests.Response. 
from hungerlib import Panel

panel = Panel("https://panel.example.com", "ptlc_yourtoken")

# Direct usage via panel.startup
response = panel.startup.list("abc123")
print(response.json())

​
list

Returns all startup variables defined for the server, along with their current values and validation rules. Endpoint: GET /api/client/servers/{server_id}/startup 
panel.startup.list(server_id)
​
server_id
str
required
The short identifier of the target server (e.g. "abc123").
Returns: requests.Response — JSON body contains a data array of variable objects. Each variable includes name, description, env_variable, default_value, server_value, is_editable, and rules (a pipe-separated Laravel validation string). 
response = panel.startup.list("abc123")
for var in response.json()["data"]:
    attrs = var["attributes"]
    print(f"{attrs['env_variable']}: {attrs['server_value']} (default: {attrs['default_value']})")

​
update

Updates the value of a single startup variable by its environment variable key. Endpoint: POST /api/client/servers/{server_id}/startup/variable 
panel.startup.update(server_id, key, value)
​
server_id
str
required
The short identifier of the target server.
​
key
str
required
The environment variable name to update (e.g. "SERVER_JARFILE", "MAX_PLAYERS"). This must match the env_variable field returned by list().
​
value
str
required
The new value to assign to the variable. Pterodactyl validates this against the variable’s rules before accepting it.
Returns: requests.Response — JSON body contains the updated variable object reflecting the new server_value. 
# Update the Minecraft server version
panel.startup.update("abc123", "SERVER_JARFILE", "server-1.20.4.jar")

# Set max players
panel.startup.update("abc123", "MAX_PLAYERS", "50")

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