Reply Agents

Agents that answer, follow up, and book the meeting

Every reply answered in minutes, day and night. Human-in-the-loop until you trust it, fully autonomous when you do. Trained on your offer, wired to your calendar, running on your own LLM key.

Free 7-day POC. Unlimited users on every plan. Works on email and LinkedIn replies alike.

Reply Agents dashboard in Master Inbox: human-in-loop mode, replies drafted, pending reviews and success rate

Watch one reply get handled

A prospect writes back. The agent drafts. One detail is unverifiable, so it stops and asks you.

Prospect reply, 21:06
Interested. We are a 40 person team and mostly on the road this week. Could we do Thursday morning?
Agent draft, 21:07 Held for review: time zone needs checking
Thursday morning works. I have 09:30 or 11:00 your time on Thursday the 12th, both open on our calendar. Say which one and I will send the invite.
Approve and send Edit Rule triggered: never state a time zone the thread has not confirmed.

An illustration of the review flow, not a screenshot. The times come from your connected calendar; the hold comes from a rule you wrote.

What the agent knows before it writes

Five inputs, all yours. Nothing is invented in between.

Your offer

What you sell, who it is for, the pricing you allow an agent to quote, and the claims it may never make.

The thread so far

Every message on this prospect, email and LinkedIn, including the campaign that started it.

Live calendar availability

Open slots read from Cal.com, Calendly, Chili Piper, Google Calendar, GoHighLevel or HubSpot at the moment of writing.

Your tone rules

Sentence length, greeting, sign-off, banned words, and how hard to push for the meeting.

Your knowledge base

FAQ, docs, case studies, and the client context attached to that workspace.

Out comes one reply

In your voice, with a real time on it, or a hold if any of the five came up short.

From drafts to autonomy

Every agent starts on a short leash. You lengthen it one label at a time.

1

Week 1

A human reviews every draft before it sends.

2

Weeks 2-4

You approve per label as the agent proves itself.

3

Trusted labels

Go autonomous. Interested replies run themselves.

A reply that makes an unverifiable promise, misses a required link, or breaks a style rule gets held for review instead of sent, no matter how autonomous the label is.

The output is a booked meeting, not a draft folder

Agents book on the calendar you already use, and stop the moment the meeting is on it.

Bookings in Master Inbox: meetings booked by reply agents through Cal.com, Calendly, Chili Piper, HubSpot, GoHighLevel and Google Calendar

Real product: the meetings your agents book, in one list.

Real slots only

Availability is read at write time from Cal.com, Calendly, Chili Piper, Google Calendar, GoHighLevel or HubSpot. No invented times.

Confirms then books

When the prospect picks, the agent books it, logs it, and triggers your reminders and workflows.

A calendar per client

Agencies attach a calendar to each client workspace, so every booking lands where it belongs.

Four switches you hold

Autonomy is granted, never assumed.

Model

Your own LLM key

Anthropic, OpenAI or OpenRouter. No markup, no metering, and you pick the model per agent.

Before launch

Testing Center

Run the agent against real past lead messages. Tune the prompt, rerun, compare, then ship.

Scope

Autonomy per label

Interested replies can run themselves while pricing asks stay human forever. Per label, per client.

Safety net

Held for review

Unverifiable promises, missing links, broken style rules: the reply waits for a human instead of sending.

Agencies run agents across dozens of client workspaces, each with its own prompt, calendar, and escalation rules. One team we work with serves 40+ clients with two reply handlers where six used to sit.

Questions we get

Will AI replies hurt my deliverability?
Replying does the opposite of cold sending: agents only answer people who already wrote to you, from your own mailboxes, on the existing thread, which reads as genuine engagement. The risk with AI is a sloppy reply, not a spam flag, and that is what human-in-the-loop, style rules, and held-for-review exist to catch.
Will the AI send something wrong to a high-value prospect?
By default, no. Every agent starts in human-in-the-loop mode, drafting replies for your team to review before anything sends. You grant autonomy one label at a time as the agent proves itself, so a pricing ask can stay human-reviewed forever while routine replies run on their own.
How much human oversight do I need?
As much as you choose, and more at the start. Every agent begins in draft mode, gets dry-run in the Testing Center against real lead messages, and earns autonomy per label. Pricing questions can stay human forever while interested replies run on autopilot.
Do I need my own OpenAI or Anthropic key?
Yes, you bring your own key from OpenAI, Anthropic, or OpenRouter. There is no markup on tokens, and you choose which model each agent runs on.
How is this different from my sequencer's AI reply agent?
Your sequencer's AI agent only sees replies to the campaigns it sent. Master Inbox's agents work replies across every sequencer you run, plus LinkedIn and inbound forms, from one set of guardrails and one calendar.
Can it actually book meetings, or just suggest times?
It books them. The agent reads live availability from Cal.com, Calendly, Chili Piper, Google Calendar, GoHighLevel or HubSpot, proposes real times in the prospect's timezone, books when the prospect confirms, logs it, and never fabricates a slot.
Does it work on LinkedIn too?
Yes. Agents answer LinkedIn conversations from HeyReach, Expandi, Aimfox and the rest the same way they answer email, with the same guardrails.
What if I just want the agent to run everything?
That is the Reply Agent plan at $499/mo: one business, the agent answers every inbound lead 24/7, books the meetings, and escalates the tricky ones to you.

See it on your own inboxes

Book a demo and watch an agent draft, escalate, and book a real meeting on a live thread.

Book a demo