AI voice agent inside Cal.com workflows that phones attendees to confirm, book, reschedule and follow up on meetings.

Mercury Agent
Open-source, self-hosted AI agent that asks before it acts, remembers your work and runs from terminal or chat apps.
What is Mercury Agent?
Mercury Agent is an MIT-licensed AI agent that runs on your own machine and works with many model providers. It has about 50 built-in tools, each gated by permissions: reads run freely, while writes, shell commands and pushes wait for your approval, and some dangerous commands are blocked in every mode. A local memory store keeps preferences, people and decisions so later sessions start with context, and a background daemon can run scheduled routines and persistent bots. Mercury Code is a repo-aware coding mode that only reports a task as complete after a build, typecheck or test has run. You can reach the agent from the terminal, a browser, Telegram, Discord, Slack or Signal. The agent itself is free to self-host. Mercury Cloud, an optional hosted dashboard for pairing and monitoring your local agent, has a Free plan at $0 per month and paid Pro at $19/month and Extended at $49/month.
Use cases
- Automate coding tasks in a repository
- Schedule recurring routines and daily briefs
- Run persistent specialist bots
- Approve agent actions from a web dashboard
- Chat with a memory-aware assistant on Telegram or Slack
- Track and cap daily token usage
Who it's for
Why use Mercury Agent
- Permission prompts keep you in control of anything that writes, runs commands or pushes code.
- The source is MIT licensed and the agent reports no telemetry, so you can run it on your own hardware.
- Memory is stored on your disk and carries preferences and decisions from one session to the next.
- You can bring your own provider keys and switch models without changing tools.
- The optional cloud dashboard adds remote chat and usage views without port forwarding.
Mercury Agent features
- About 50 built-in tools, each gated by permissions
- Ask Me or Allow All permission modes with a shell command blocklist
- Local Second Brain memory built on SQLite with full-text search
- Mercury Code mode that verifies work with a build, typecheck or test
- Background daemon with cron schedules and a durable job queue
- Mercury Bots with their own persona, model, memory and permissions
- Support for 10+ model providers with automatic fallback
- Daily token budgets with a Token Saver Mode
- Channels for terminal, web, Telegram, Discord, Slack and Signal
- Mercury Cloud dashboard for pairing, chat, approvals and usage
Mercury Agent integrations
How to get started with Mercury Agent
- Install the standalone binary with the install script, or install the npm package.
- Run mercury in a project folder, choose a model provider and pick Ask Me or Allow All mode.
- Give it a task; it plans, calls tools and asks for approval before risky actions.
- Optionally run mercury up so the agent runs as a background service with scheduled routines.
- Optionally run mercury cloud connect to pair the agent with the Mercury Cloud dashboard.
Mercury Agent limitations
- Mercury Cloud Free includes 1 agent connection and 5,000 Mercury Credits per month
- Cloud pairing needs Mercury Agent 1.2.0 or later
- Card validation may be required to open a Mercury Cloud Free account
- Fully managed hosting through Atomic Bot is a separate paid service
Mercury Agent pricing
Mercury Agent is open source, so you can use and self-host it for free. Paid plans start at $19 per month, according to the official pricing page on .
Mercury Agent plans
Free
$0/month
Mercury Cloud
- Cloud account access
- 1 agent connection
- 5,000 Mercury Credits / month
- Memory sync and dashboard access
Pro
$19/month
Mercury Cloud, billed monthly
- 19,000 Mercury Credits / month
- 5 agent connections
- Live agent status and remote control
- Usage analytics and billing controls
Extended
$49/month
Mercury Cloud, billed monthly
- 49,000 Mercury Credits / month
- 15 agent connections
- Increased request throughput
- Advanced memory workflows
Plans as listed on the official pricing page on . Prices can change and may vary by country or exclude tax. Check the official pricing page.
Mercury Agent alternatives
The main Mercury Agent alternatives listed on Debuly are OpenClaw, Hermes Agent, goose, nanobot, Claude Code and Aider. The table compares pricing and platforms; order is A–Z.
| Tool | Pricing | Starting price | Platforms |
|---|---|---|---|
| Mercury Agent | Open source | $19/mo | CLI, Web, Self-hosted, Telegram |
| Aider | Open source | — | CLI, Self-hosted, Web |
| Claude Code | Paid | — | macOS, Linux, Windows, Web |
| goose | Open source | — | macOS, Linux, Windows, CLI |
| Hermes Agent | Open source | — | macOS, Windows, Linux, CLI |
| nanobot | Open source | — | Web, CLI, Self-hosted, macOS |
| OpenClaw | Open source | — | macOS, Windows, Linux, iOS |
Aider
Open-source AI pair programming tool that runs in your terminal and edits code in your local git repository using the LLM you choose.
Open sourceVisit Aider (official site)
Claude Code
Anthropic's coding agent that fixes bugs, writes tests and runs migrations from your terminal, IDE, desktop app, web or Slack.

goose
Open source AI agent that runs on your machine as a desktop app, CLI or API and connects to tools through MCP extensions.
Open sourceVisit goose (official site)
Hermes Agent
Free, MIT-licensed AI agent from Nous Research with persistent memory, auto-built skills, scheduling and chat-app access.
Open sourceVisit Hermes Agent (official site)
nanobot
Open-source, lightweight AI agent you run yourself, with a web UI, MCP tools, memory, automations and chat app channels.
Open sourceVisit nanobot (official site)
OpenClaw
Open-source personal AI assistant that runs on your own devices and takes actions for you through WhatsApp, Telegram, Slack, Discord and other chat apps.
Open sourceVisit OpenClaw (official site)
Mercury Agent FAQ
How much does Mercury Agent cost?
The agent is MIT licensed and free to self-host. Mercury Cloud is optional: Free is $0/month, Pro is $19/month and Extended is $49/month, billed monthly in USD.
Is there a free plan?
Yes. Mercury Cloud Free costs $0/month and includes 1 agent connection and 5,000 Mercury Credits per month, though card validation may be required. The local CLI is also free.
What plans does Mercury Cloud have?
Free ($0/month, 5,000 credits, 1 agent), Pro ($19/month, 19,000 credits, 5 agents) and Extended ($49/month, 49,000 credits, 15 agents). Top-up balances on paid plans never expire.
Is Mercury Agent open source?
Yes. The Mercury Agent CLI is MIT licensed and can be self-hosted, and the site states the agent sends no telemetry.
Can I use my own model keys?
Yes. Mercury Agent is provider-agnostic and the local CLI can use your own provider keys, while Cloud plans add managed access and usage controls.
What are alternatives to Mercury Agent?
Related open-source agents include OpenClaw, Hermes Agent, Goose and Nanobot.
Sources & verification
Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.
| Source | Type | Accessed |
|---|---|---|
| mercuryagent.sh/ | official | |
| github.com/cosmicstack-labs/mercury-agent | repository | |
| cloud.mercuryagent.sh/pricing | pricing | |
| cloud.mercuryagent.sh/landing | official | |
| mercuryagent.sh/docs/getting-started/platforms/cloud-instance | docs | |
| mercuryagent.sh/cloud | official |
Image credits
- Logo: from mercuryagent.sh · fetched · Vendor trademark, used only to identify the product; removed on request
- Cover: none collected yet, so a generated tile is shown.
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