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A custom AI SDR agent built on your ICP and data

Short answer

An AI SDR agent is software that researches prospects, writes personalised outreach, sends follow-ups and books meetings, doing the repetitive top-of-funnel work a sales development rep normally does. It works best alongside human reps, taking on research and first touches while people handle live conversations and complex accounts. A custom AI SDR built on your own ICP, CRM history and messaging usually outperforms a generic tool because it knows who actually buys from you.

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Key takeaways

  • An AI SDR automates prospect research, first drafts, sequencing and meeting booking.
  • Human SDRs still win on live calls, multi-threaded enterprise deals and judgement calls.
  • Deliverability depends on domain setup, volume limits and list quality, not the AI itself.
  • Custom agents make sense when your ICP, data or process differs from what tools assume.

What an AI SDR is and what it actually does

An AI SDR is an outbound sales agent that handles the research and writing parts of prospecting. It pulls accounts that match your ideal customer profile, enriches contacts from sources such as Apollo or Clay, reads recent company news or hiring activity, and drafts an opening email or LinkedIn message that references something real. It then runs the sequence, watches for replies and hands warm conversations to a person or a calendar link.

The useful mental model is a very fast research assistant with a writing habit, not a replacement rep. Good AI outbound sales agents are narrow: they work one segment, one offer and one channel well before expanding. The best AI SDR tools and custom builds share the same traits: clean input data, clear rules about who not to contact, and a human reviewing messages until the output is consistently on brand.

AI SDR vs human SDR: which is better?

Neither is better across the board. An AI SDR is the better choice for high-volume, well-defined segments where the value is in research coverage and consistent follow-up: it can work hundreds of accounts a day and never forgets a touch. A human SDR is the better choice for enterprise accounts with several stakeholders, for phone-heavy motions, and for markets where relationships and credibility matter more than volume. Humans also notice when a prospect is annoyed or confused far earlier.

Most teams land on a hybrid. The agent handles list building, enrichment, first drafts and follow-ups, and reps spend their time on replies, calls and discovery. In comparable deployments this shifts SDR time from roughly 60 to 70 percent admin and research toward mostly conversations. If you have no sales process yet, fix that first: automating an unproven message only sends it to more people faster.

Buy an AI SDR tool or build a custom one

Off-the-shelf AI SDR tools are quick to start and cost a predictable monthly fee, typically from a few hundred to a few thousand dollars per seat or workspace. They suit teams with a standard motion: one CRM, email plus LinkedIn, and an ICP that fits common filters. Their limits show when you need your own data sources, unusual qualification rules, or messaging that depends on product usage or past deals that the tool cannot see.

A custom AI SDR agent runs inside your existing stack, such as HubSpot or Salesforce, your sending domains and your Slack, and follows your rules. Build costs for this kind of project generally range from low five figures for a focused pilot to more for multi-channel systems, driven by the number of data sources, channels and approval steps. Velum scopes the work first and quotes a fixed price, and every send can require a person's approval until you trust it.

How it works

  1. 1

    Define the ICP and the no-go list

    We turn your best closed-won deals into explicit targeting rules and a list of accounts, roles and regions the agent must never contact.

  2. 2

    Connect data and sending infrastructure

    We wire in your CRM, enrichment sources and dedicated sending domains with authentication and volume limits set before any outreach.

  3. 3

    Build research and drafting

    The agent researches each account and drafts messages in your voice, citing the signal it used so reviewers can check it quickly.

  4. 4

    Set up handoff and logging

    Replies are classified and routed to the right rep, and every touch is logged to the CRM so nothing lives only in the tool.

  5. 5

    Pilot with human approval

    We launch on one segment with a person approving every send, then loosen approval only for message types that stay consistently accurate.

Before and after

TaskBy handWith agents
Accounts researched per rep per day20 to 40150 to 400 with review
Time to first touch on a new lead1 to 3 daysUnder 1 hour
SDR time spent on research and admin60 to 70 percent20 to 30 percent
Follow-ups missedCommon after touch threeRare, sequenced automatically

Typical ranges from comparable deployments. Your baseline is measured before anything is built.

Tools it works with

  • HubSpot
  • Salesforce
  • Apollo
  • Clay
  • LinkedIn Sales Navigator
  • Gmail
  • Microsoft 365
  • Slack
  • Claude
  • OpenAI

Related guides

Questions people ask

01

What is an AI SDR?

An AI SDR is an agent that does the repetitive work of a sales development rep: finding prospects, researching them, writing outreach, following up and booking meetings. It is usually paired with human reps who take over once a prospect replies with interest.

02

AI SDR vs human SDR: which is better?

An AI SDR is better for high-volume, clearly defined segments where coverage and consistent follow-up matter most. A human SDR is better for complex enterprise deals, phone-led selling and relationship-driven markets. Most teams get the best results by letting the agent handle research and first touches while people handle conversations.

03

How much does an AI SDR cost?

Off-the-shelf AI SDR tools typically cost from a few hundred to a few thousand dollars a month, plus data and sending infrastructure. Custom builds usually start in the low five figures for a focused pilot, with cost driven by data sources, channels and approval workflows. Velum quotes a fixed price after a scoping call.

04

Do AI SDRs actually book meetings?

Yes, when the targeting and offer are sound. Typical reply rates for well-targeted, personalised outbound sit in the low single digits, and an AI SDR mainly raises the volume of quality touches rather than the rate itself. If your manual outbound does not book meetings, an AI SDR will not fix the underlying message.

05

Will AI SDR emails hurt my domain deliverability?

They can if you send high volumes from your main domain to unverified lists. Use separate warmed sending domains with SPF, DKIM and DMARC set up, keep daily volume per mailbox modest, verify addresses and stop contacting people who do not engage. Deliverability is a setup and discipline problem, not something the AI solves or causes on its own.

06

Should I buy an AI SDR tool or build a custom one?

Buy a tool if your motion is standard and you want to start this month. Build a custom agent if you need your own data, qualification rules or CRM logic that tools cannot reach, or if you want everything to run inside systems you already own. Many teams start with a tool, learn what works, then build the parts that matter.

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