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Tutorial 46 — Copilot CLI governance installer

Package: @microsoft/agent-governance-copilot-cli · Time: 15 minutes · Prerequisites: Node.js 22+, GitHub Copilot CLI with extensions enabled

This tutorial shows how to install the AGT Copilot CLI governance package, confirm the extension is active, and exercise the guarded repo triage scenario.

What you'll do

  1. install the production Copilot CLI governance package
  2. confirm the local extension is loaded
  3. run prompt, tool, and tool-output checks
  4. compare the results against the scenario expectations

Install the package

npx @microsoft/agent-governance-copilot-cli install

If you want to preserve an existing user policy, run the install without --force-policy. If you want to reset to the packaged baseline, add:

npx @microsoft/agent-governance-copilot-cli install --force-policy

To refresh an existing AGT-managed install after pulling a newer package build:

npx @microsoft/agent-governance-copilot-cli update
npx @microsoft/agent-governance-copilot-cli update --force-policy

Enable Copilot CLI extensions

Add the extension flags to your Copilot CLI settings if they are not already present:

{
  "experimental": true,
  "experimental_flags": ["EXTENSIONS"]
}

Reload Copilot CLI:

/clear
/agt status

At this point /agt status should report:

  • the active policy source
  • the vendored SDK source
  • the audit path
  • the configured prompt defense floor

Run the guarded scenario

Open the scenario from the repo:

Then run the scenario in order:

  1. paste prompts/prompt-injection.txt
  2. paste prompts/unsafe-bootstrap.txt
  3. run /agt check "<contents of tool-output/poisoned-web-content.txt>"
  4. compare against expected-outcomes.md

For a proof-oriented threat matrix and evidence checklist, also see:

Example install from source

When developing from the repo, you can also use the local package directly:

cd agent-governance-copilot-cli
npm install
node ./bin/agt-copilot.mjs install

Troubleshooting

/agt is not available

Check:

  • the extension exists under ~/.copilot/extensions/agt-global-policy
  • extensions are enabled in Copilot CLI settings
  • you reloaded Copilot CLI with /clear

agt-copilot doctor

Run:

agt-copilot doctor

Doctor validates:

  • extension installation state
  • AGT install manifest presence
  • vendored SDK presence
  • user policy parseability and supported schema version
  • installed extension version versus the package version you are running
  • Copilot CLI extension settings

If doctor reports an invalid policy, remove ~/.copilot/agt/policy.json or set AGT_COPILOT_POLICY_PATH to a valid replacement before reloading Copilot CLI.

Try an example policy profile

The example repo path includes ready-to-copy policy profiles:

  • examples/copilot-cli-agt/config/profiles/strict.json
  • examples/copilot-cli-agt/config/profiles/balanced.json
  • examples/copilot-cli-agt/config/profiles/advisory.json

For example:

Copy-Item .\examples\copilot-cli-agt\config\profiles\balanced.json $HOME\.copilot\agt\policy.json -Force

Then reload Copilot CLI with /clear and inspect the result with /agt status.

You can also manage policy files directly with the installer CLI:

agt-copilot policy path
agt-copilot policy validate
agt-copilot policy apply --profile balanced

Node is missing

This package requires a working Node runtime. If node --version fails, install Node.js LTS and retry the package install.

Next steps

  • customize ~/.copilot/agt/policy.json for your team baseline
  • re-run the scenario in advisory mode
  • inspect the audit log at ~/.copilot/agt/audit-log.json