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Install

The Nanny CLI is a system tool — install it once and use nanny run from any project. 
brew tap nanny-run/nanny
brew install nannyd
Verify the installation: 
nanny --version

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Initialise a config

Run this in the root of your project: 
nanny init
This writes a nanny.toml with safe defaults: 
[runtime]
mode = "local"

[start]
# How to launch your agent. nanny run reads this command.
cmd = "python agent.py"

[limits]
steps   = 100
cost    = 1000
timeout = 30000
Set [start].cmd to your agent’s entry point and edit the limit values to match your requirements.

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Run your agent

nanny run
Nanny reads [start].cmd from nanny.toml, spawns the process, and kills it the moment any limit is crossed.

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Use named limits

Define limit sets for different workloads in the same nanny.toml: 
[limits]
steps   = 50
cost    = 500
timeout = 15000

[limits.researcher]
steps   = 200
cost    = 5000
timeout = 120000
Then activate a named set at runtime: 
nanny run --limits=researcher
Named sets inherit from [limits] and override only the fields you declare.

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Read the event log

Every run emits structured NDJSON to stdout: 
{"event":"ExecutionStarted","ts":1711234567000,"limits":{"steps":100,"cost":1000,"timeout":30000},"limits_set":"[limits]","command":"python agent.py"}
{"event":"ExecutionStopped","ts":1711234572000,"reason":"AgentCompleted","steps":7,"cost_spent":70,"elapsed_ms":4823}
Pipe it to a file or your log aggregator: 
nanny run >> nanny.log
Or configure file output directly in nanny.toml: 
[observability]
log      = "file"
log_file = "nanny.log"