az-scout-plugin-odcr-coverage 2026.4.0

az-scout plugin for On-Demand Capacity Reservation (ODCR) coverage analysis

az-scout-plugin-odcr-coverage

An az-scout plugin that analyses On-Demand Capacity Reservation (ODCR) coverage for Azure VMs.

Identifies VMs at risk of allocation failure by combining VM inventory, Activity Log allocation events, and existing ODCR utilization — then classifies each VM by risk level.

Features

• Risk classification — critical (past allocation failures), high (always-on without ODCR), medium, low, covered
• Allocation event timeline — start/deallocate/failed events from Activity Log with configurable lookback (3–30 days)
• ODCR utilization — reserved capacity, used/unused counts per reservation group
• Multi-subscription — analyse across multiple subscriptions with incremental rendering and progress bar
• SSE streaming — two-phase analysis: VMs load instantly, Activity Log events stream page-by-page with day-based progress
• VM detail modal — click any VM row to see risk profile, allocation summary, and event timeline
• Cross-highlighting — hover an ODCR card to highlight associated VMs, and vice versa
• Azure Portal links — direct links to each VM in the Azure Portal
• MCP tools — three tools with tiered performance for AI agents:
  • get_odcr_coverage_summary — fast overview (no Activity Log)
  • get_odcr_vm_allocation_history — drill-down for specific VMs
  • get_odcr_coverage — full analysis with allocation events
• Chat mode — "ODCR Advisor" with tool selection guidance
• Caching — VM list (5 min), capacity reservations (5 min), activity log (10 min)

Installation

pip install az-scout-plugin-odcr-coverage
# or
uv pip install az-scout-plugin-odcr-coverage

Restart az-scout — the plugin is discovered automatically.

MCP Tools

Tool	Parameters	Description
get_odcr_coverage_summary	region, subscription_id, tenant_id?	Fast ODCR overview — VMs + utilization, no Activity Log
get_odcr_vm_allocation_history	region, subscription_id, vm_names, lookback_days? (7), uptime_threshold? (90), tenant_id?	Allocation events + accurate risk for specific VMs
get_odcr_coverage	region, subscription_id, lookback_days? (7), uptime_threshold? (90), tenant_id?	Full analysis with per-VM allocation history

RBAC Requirements

Role	Why
Reader	List VMs (via ARG), Capacity Reservation Groups
Reader or Monitoring Reader	Activity Log queries

Setup

uv pip install az-scout-plugin-odcr-coverage
az-scout  # plugin is auto-discovered

For development:

git clone https://github.com/az-scout/az-scout-plugin-odcr-coverage
cd az-scout-plugin-odcr-coverage
uv sync --group dev
uv pip install -e .
az-scout  # plugin is auto-discovered

Structure

az-scout-plugin-odcr-coverage/
├── .github/
│   ├── copilot-instructions.md  # Copilot context for this plugin
│   └── workflows/
│       └── ci.yml               # CI pipeline (lint + test, Python 3.11–3.13)
├── pyproject.toml
├── README.md
└── src/
    └── az_scout_odcr_coverage/
        ├── __init__.py          # Plugin class + module-level `plugin` instance
        ├── routes.py            # FastAPI APIRouter (optional)
        ├── tools.py             # MCP tool functions (optional)
        └── static/
            ├── css/
            │   └── odcr-coverage.css      # Plugin styles (auto-loaded via css_entry)
            ├── html/
            │   └── odcr-coverage-tab.html # HTML fragment (fetched by JS at runtime)
            └── js/
                └── odcr-coverage-tab.js   # Tab UI logic (auto-loaded via js_entry)

How it works

1. The plugin JS loads the HTML fragment into #plugin-tab-odcr-coverage.
2. It listens to azscout:* context events from the core app.
3. When tenant and region are set, it fetches subscriptions from /api/subscriptions.
4. The user picks subscriptions and clicks Analyse.
5. For each subscription, an SSE stream (GET /plugins/odcr-coverage/coverage/stream) delivers results in two phases:
   • Phase 1 — VMs and ODCR utilization load instantly via Azure Resource Graph.
   • Phase 2 — Activity Log events stream page-by-page, progressively enriching VM risk levels and allocation stats. Progress is displayed as days covered (e.g. "events 12/30d").
6. The table, summary cards, and risk bar update incrementally as data arrives.

Quality checks

uv run ruff check src/ tests/
uv run ruff format --check src/ tests/
uv run mypy src/
uv run pytest

Copilot support

The .github/copilot-instructions.md file provides context to GitHub Copilot about the plugin structure, conventions, and az-scout plugin API.

License

MIT

Disclaimer

This tool is not affiliated with Microsoft. All capacity, pricing, and availability information is indicative and not a guarantee of deployment success. Values are dynamic and may change between planning and actual deployment. Always validate in official Microsoft sources and in your target tenant/subscription.