[External Plugin]: arcus

[development-testsigma]

Plugin name

arcus

Short description

Records Copilot CLI sessions — prompts, tool calls, and file snapshots — to a local JSONL log via lifecycle hooks, so the work done in a session can be reviewed, mapped to a ticket, and turned into e2e test cases. Optionally syncs that history to Testsigma for teams that use it.

GitHub repository

testsigmahq/arcus-copilot-plugin

Plugin path inside the repository

No response

Ref to review

v1.0.0

Commit SHA to review

afa50cce728559c20904865a9acbdf569e09095a

Version

1.0.0

License identifier

MIT

Author name

Testsigma

Author URL

https://testsigma.com

Homepage URL

https://testsigma.com

Keywords

testsigma
arcus
test-automation
e2e-testing
session-capture
qa

Additional notes for reviewers

Commercial disclosure up front: I work at Testsigma. Per the guidance in
discussion #968, here is exactly what depends on a Testsigma account and what
does not, so you can judge the split rather than take my word for it.

There is a permanent $0 tier, not just a trial — Testsigma Test Management
has a "Free Forever" plan (up to 10 users; unlimited projects, test cases and
test runs; 10 GB storage; 60-day retention; no card, immediate access):
https://testsigma.com/pricing?product=test-management — note the
?product=test-management tab specifically; the default pricing pane shows only
the paid Web Testing plans. So this plugin is usable end to end without a paid
subscription, and the paid tiers add scale rather than unlocking the plugin.

What works with no account and no network: the capture layer. Lifecycle hooks
(sessionStart, userPromptSubmitted, pre/postToolUse, errorOccurred,
sessionEnd) write session_manifest.json + events.jsonl under the plugin
data dir. Ingest is auth-gated and off by default — until a user runs
/arcus:login, nothing is transmitted; unauthenticated sessions only write local
files. There is no signup prompt, nag, or telemetry on install.

What requires a Testsigma account (the free tier is sufficient): /arcus:push (sync to Agentic Test) and the project

Dependencies are deliberately thin, since I saw prior submissions declined for
opaque third-party code. The scripts are standard-library only — urllib, json,
hashlib, base64, pathlib, webbrowser, fcntl. keyring is the sole
optional extra and is imported inside a try/except with a graceful fallback
(scripts/auth/keystore.py:23), so nothing needs installing for the plugin to
run. No npm packages, no vendored binaries, no curl-to-shell.

Credential handling: a refresh token in the OS keychain plus a 0600 config
file in the plugin data dir. No .env, no plaintext secrets on disk. Access
tokens are refreshed lazily; account_id comes from JWT claims captured at login.

Layout: plugin at the repository root, manifest at
.github/plugin/plugin.json, commands in commands/, hooks in
hooks/hooks.json. Hosts (apiServer / authServer) are read from the plugin's
own committed .github/plugin/marketplace.json, so this listing needs no config
block.

I recognise session capture touches sensitive data, so I'd rather over-disclose:
if you'd prefer the ingest side gated differently, or the listing scoped to the
local-capture commands only, I'm happy to adjust.

Unrelated: the Open VSX entry testsigma/arcus is our separate Cursor
extension (testsigmahq/arcus-cursor-extension). This submission is the Copilot
CLI plugin.

Submission checklist

• The plugin lives in a public GitHub repository.
• The ref and/or sha I provided is immutable (release tag and/or full 40-character commit SHA), not a branch.
• This submission follows this repository's contribution, security, and responsible AI policies.
• This plugin is not already listed in the Awesome Copilot marketplace.

[github-actions]

✅ External plugin intake passed

This submission passed automated intake validation and quality checks and is ready for maintainer review.

• Plugin: arcus
• Repository: https://github.com/testsigmahq/arcus-copilot-plugin
• Ref: v1.0.0
• SHA: afa50cce728559c20904865a9acbdf569e09095a

Quality gate summary

Gate	Status
vally lint	pass
install smoke test	pass
version match	pass
canvas structure	not_run

• vally lint: pass
• install smoke test: pass
• version match: pass
• canvas structure: not_run
• overall: pass

vally lint output

0 skill(s) linted

Install smoke test output

Install smoke test succeeded. Verified /tmp/external-plugin-quality-o60YWY/copilot-home/.copilot/installed-plugins/external-plugin-intake/arcus/.github/plugin/plugin.json.

Version match output

- v1.0.0: matched version "1.0.0" at ".github/plugin/plugin.json".
- afa50cce728559c20904865a9acbdf569e09095a: matched version "1.0.0" at ".github/plugin/plugin.json".

Canvas structure output

Canvas structure gate skipped because plugin is not tagged with "canvas".

Canonical external.json payload

{
  "name": "arcus",
  "description": "Records Copilot CLI sessions — prompts, tool calls, and file snapshots — to a local JSONL log via lifecycle hooks, so the work done in a session can be reviewed, mapped to a ticket, and turned into e2e test cases. Optionally syncs that history to Testsigma for teams that use it.",
  "version": "1.0.0",
  "author": {
    "name": "Testsigma",
    "url": "https://testsigma.com"
  },
  "repository": "https://github.com/testsigmahq/arcus-copilot-plugin",
  "homepage": "https://testsigma.com",
  "license": "MIT",
  "keywords": [
    "testsigma",
    "arcus",
    "test-automation",
    "e2e-testing",
    "session-capture",
    "qa"
  ],
  "source": {
    "source": "github",
    "repo": "testsigmahq/arcus-copilot-plugin",
    "ref": "v1.0.0",
    "sha": "afa50cce728559c20904865a9acbdf569e09095a"
  }
}

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