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Work with SuperMailOS email from Copilot CLI: triage unread mail, search conversations and attachments, save draft replies, track follow-ups, and send only when asked. Bundles the hosted SuperMailOS MCP server and five skills.
Submitted by the SuperMailOS team (affiliated with the service; SuperMailOS is a paid email host with a free trial).
Agent Plugins layout at the repo root: plugin.json + mcp.json (one streamable-http server, https://supermailos.com/mcp) and five skills under skills/. It installs with copilot plugin marketplace add SuperMailOS/plugin and copilot plugin install supermailos@supermailos.
Auth: OAuth 2.1 sign-in discovered from the server's 401 (RFC 9728 metadata, dynamic client registration). No secrets in the repo.
Safety: the skills default to drafts, send only on an explicit request, never mark mail read unless asked, and treat email content as untrusted (never as instructions).
Checked before submitting: @microsoft/vally lint passes for all five skills, and the Copilot CLI install works from a local copy of this commit.
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.
Agent Plugins v1.0.0 manifest checks passed for plugin.json.
vally lint output (✅ pass)
✅ follow-ups (2/2 checks passed)
✓ [spec-compliance] All 1 skill(s) are spec-compliant.
✓ spec-compliance: All spec checks passed.
✓ [valid-refs] All file references across 1 skill(s) are valid.
✓ valid-refs: All file references resolve to existing files within the skill directory.
✅ getting-started (2/2 checks passed)
✓ [spec-compliance] All 1 skill(s) are spec-compliant.
✓ spec-compliance: All spec checks passed.
✓ [valid-refs] All file references across 1 skill(s) are valid.
✓ valid-refs: All file references resolve to existing files within the skill directory.
✅ inbox-triage (2/2 checks passed)
✓ [spec-compliance] All 1 skill(s) are spec-compliant.
✓ spec-compliance: All spec checks passed.
✓ [valid-refs] All file references across 1 skill(s) are valid.
✓ valid-refs: All file references resolve to existing files within the skill directory.
✅ mail-search (2/2 checks passed)
✓ [spec-compliance] All 1 skill(s) are spec-compliant.
✓ spec-compliance: All spec checks passed.
✓ [valid-refs] All file references across 1 skill(s) are valid.
✓ valid-refs: All file references resolve to existing files within the skill directory.
✅ reply-drafting (2/2 checks passed)
✓ [spec-compliance] All 1 skill(s) are spec-compliant.
✓ spec-compliance: All spec checks passed.
✓ [valid-refs] All file references across 1 skill(s) are valid.
✓ valid-refs: All file references resolve to existing files within the skill directory.
5 skill(s) linted, 5 passed
install smoke test output (✅ pass)
Install smoke test succeeded. Verified /tmp/external-plugin-quality-zvgJPd/copilot-home/.copilot/installed-plugins/external-plugin-intake/supermailos/plugin.json.
Version match output
- v1.0.1: matched version "1.0.1" at "plugin.json".
- bab2d6aa2fa27cfb4a6c6b1c874ec4b77c25acf2: matched version "1.0.1" at "plugin.json".
Ref/SHA consistency output
source.ref "v1.0.1" resolves to the same commit as source.sha "bab2d6aa2fa27cfb4a6c6b1c874ec4b77c25acf2".
Canvas structure output
Canvas structure gate skipped because plugin is not tagged with "canvas".
Canonical external.json payload
{
"name": "supermailos",
"description": "Work with SuperMailOS email from Copilot CLI: triage unread mail, search conversations and attachments, save draft replies, track follow-ups, and send only when asked. Bundles the hosted SuperMailOS MCP server and five skills.",
"version": "1.0.1",
"author": {
"name": "SuperMailOS",
"url": "https://supermailos.com"
},
"repository": "https://github.com/SuperMailOS/plugin",
"homepage": "https://supermailos.com/docs/mcp",
"license": "MIT",
"keywords": [
"email",
"mcp",
"productivity",
"inbox",
"drafts"
],
"source": {
"source": "github",
"repo": "SuperMailOS/plugin",
"ref": "v1.0.1",
"sha": "bab2d6aa2fa27cfb4a6c6b1c874ec4b77c25acf2"
}
}
Activity
github-actions commentedon Oct 19, 2026
✅ External plugin intake passed
This submission passed automated intake validation and quality checks and is ready for maintainer review.
View workflow run · Download full quality gate logs
v1.0.1bab2d6aa2fa27cfb4a6c6b1c874ec4b77c25acf2Reviewer signals
These are non-blocking heuristics for maintainer review; they are not evidence of misconduct or low quality.
Quality gate summary
Legend: ✅ pass ·⚠️ warning · 🛑 fail
spec compliance output (✅ pass)
vally lint output (✅ pass)
install smoke test output (✅ pass)
Version match output
Ref/SHA consistency output
Canvas structure output
Canonical external.json payload
{ "name": "supermailos", "description": "Work with SuperMailOS email from Copilot CLI: triage unread mail, search conversations and attachments, save draft replies, track follow-ups, and send only when asked. Bundles the hosted SuperMailOS MCP server and five skills.", "version": "1.0.1", "author": { "name": "SuperMailOS", "url": "https://supermailos.com" }, "repository": "https://github.com/SuperMailOS/plugin", "homepage": "https://supermailos.com/docs/mcp", "license": "MIT", "keywords": [ "email", "mcp", "productivity", "inbox", "drafts" ], "source": { "source": "github", "repo": "SuperMailOS/plugin", "ref": "v1.0.1", "sha": "bab2d6aa2fa27cfb4a6c6b1c874ec4b77c25acf2" } }