Open-source cloud cost tools for AI agents

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Three tools, two of which need an account

Ordered by how much it costs you to try them. Start at the top.

focus-mcp

Query your billing data in plain language

FOCUS is the FinOps Open Cost and Usage Specification, the open standard for cloud billing data. AWS, Microsoft and Google Cloud all export it natively, which means one schema and one set of queries work across every provider.

The FOCUS MCP Server connects Claude, or any MCP client, to that data. Questions that used to mean hand-written SQL become one-line prompts.

• “What are my highest-cost services by region this month?”
• “Show me commitment discount utilization trends.”
• “Which accounts have unusual spending patterns?”
• “Explain the difference between BilledCost and EffectiveCost.”

# Run the published package — no clone, no containeruvx focus-mcp # Register it with Claude Code in one commandclaude mcp add focus -e FOCUS_DATA_LOCATION=/path/to/your/focus/data -- uvx focus-mcp

# Pinned, attested imagedocker pull glassity/focus-mcp:latest claude mcp add focus -- docker run -i --rm \  -v /path/to/your/focus/data:/data:ro \  -e FOCUS_DATA_LOCATION=/data \  glassity/focus-mcp:latest

glassity CLI

The FinOps loop from your terminal

glassity is the command-line interface to Glassity, a FinOps platform for AWS estates. It reads the same whether a person or an agent runs it: flags in, JSON out, stable exit codes, no prompts on the critical path.

Command groups cover opportunities, cost analysis, recommendations, assignments, governance, and raw API access. There is also a filesystem mount that serves a server-built snapshot of your AWS estate over FUSE as a read-only tree.

$ glassity opp list --stage assessment --min-savings 1000Tenant: Example Corp (id: acc_demo) | AWS account: 123456789012ID          STAGE       POTENTIAL/MO  RESOURCES  TITLEopp_7f2a91  assessment  $4182.40      37         Idle NAT gateways in eu-west-1opp_3c8b04  assessment  $1290.00      12         Oversized db.r6g fleet in prod $ glassity opp transition asg_demo123 --target-state execution --comment "rightsizing merged"About to perform a mutation. Re-run with --confirm-token=<TOKEN> to execute.     PATCH https://app.glassity.cloud/api/v1/agent/assignments/asg_demo123/transition?account_id=acc_demo    Authorization: token <REDACTED — sk_live_*********** by glassity binary>     {"comment":"rightsizing merged","target_state":"execution"} Token expires in 1m0s. Cannot be redeemed in less than 1.5s (review window).

No network call yet: those are the exact bytes phase two sends. Values above are examples.

# Homebrew (macOS)brew install glassity/tap/glassity # Gogo install github.com/glassity/cli/cmd/glassity@latest

Release tarballs ship for Linux and Darwin on amd64 and arm64, each with SHA-256 checksums.

agent-skills

Hand the whole loop to your agent

Ask your agent what you spent on AWS last month. Ask which savings opportunities are worth the engineering time, and which are Fool's Gold. Ask whether your reservations still cover your fleet.

This is a Claude Code plugin over the glassity CLI. It ships the skills that teach an agent your cost surface, the subagents that dig into one opportunity at a time, and the slash commands for the full FinOps loop from discovery to closure.

The questions that matter are follow-ups. Which service drove that spike? Is it one account or all of them? What would rightsizing actually save, net of the week it takes? Each one is a different query, and answering them in a conversation is faster than clicking through six screens.

Six slash commands covering the five-step loop:

# Claude Code plugin marketplaceclaude plugin marketplace add glassity/agent-skills/plugin install glassity # npm, if you would rather not use the marketplacenpx @glassity/agent-skills install          # -> ~/.claudenpx @glassity/agent-skills install --here   # -> ./.claude, project-local # then install the CLI and sign inbrew install glassity/tap/glassityglassity auth login

Start here

Two paths, depending on how far you want to go