SendKit
Cold email on a dedicated IP, with a way to check it before you send.
SendKit is an outreach sequencer, and one of the 53 tools hyreflow connects to Claude, ChatGPT and other AI assistants. Through hyreflow, an AI agent can run 36 actions: 18 that look something up and 18 that create or change records. SendKit runs on your own SendKit account: hyreflow charges no credits for it, and SendKit bills you as before.
SendKit is the one sequencer where your agent can check mailbox health, warmup and inbox placement before a campaign sends. Every account runs on its own sending environment, and your agent can run blacklist tests too, so you do not learn about a bad mailbox from the bounce rate.
SendKit is activation with a deliverability check built in. Sourcing and enrichment fill the list; SendKit's own health reads decide whether a mailbox is ready to carry it.
What can you ask Claude or ChatGPT to do with SendKit?
With hyreflow connected, you ask for the outcome in plain language and the assistant runs SendKit for you. For example:
- “Is this mailbox warmed up enough to add to a campaign?”
- “Load these 200 into a new campaign, but only once Enrichley has cleared the addresses”
- “Run a blacklist test on the mailboxes before we start sending”
- “Anyone who replies, create them in Recruit CRM”
Which tools work well with SendKit?
In a hyreflow run, SendKit is most often paired with Enrichley, FullEnrich, Recruit CRM and hyreflow Agent.
- Enrichley
validate the list before it meets a warmed mailbox
- FullEnrich
the waterfall that fills the campaign
- Recruit CRM
turn a reply into a record instead of a screenshot
- hyreflow Agent
personalise the sequence before it goes out
Which SendKit actions can an AI agent run through hyreflow?
Through hyreflow, an AI agent can run 36 SendKit actions: 18 that look something up and 18 that create or change records. SendKit runs on your own SendKit account: hyreflow charges no credits for it, and SendKit bills you as before.
| SendKit action | What it does | Cost through hyreflow |
|---|---|---|
| Search leads | Looks something up | no hyreflow credits |
| Add campaign leads | Creates or changes a record | no hyreflow credits |
| Add do-not-contact entries | Creates or changes a record | no hyreflow credits |
| Create blacklist test | Creates or changes a record | no hyreflow credits |
| Create campaign | Creates or changes a record | no hyreflow credits |
| Create inbox placement test | Creates or changes a record | no hyreflow credits |
| Create lead | Creates or changes a record | no hyreflow credits |
| Create leads bulk | Creates or changes a record | no hyreflow credits |
| Start campaign | Creates or changes a record | no hyreflow credits |
| Start warmup | Creates or changes a record | no hyreflow credits |
Show all 36 SendKit actions →
| SendKit action | What it does | Cost through hyreflow |
|---|---|---|
| Bulk warmup | Creates or changes a record | no hyreflow credits |
| Campaign leads action | Creates or changes a record | no hyreflow credits |
| Pause campaign | Creates or changes a record | no hyreflow credits |
| Pause warmup | Creates or changes a record | no hyreflow credits |
| Resume campaign | Creates or changes a record | no hyreflow credits |
| Resume warmup | Creates or changes a record | no hyreflow credits |
| Stop warmup | Creates or changes a record | no hyreflow credits |
| Update campaign | Creates or changes a record | no hyreflow credits |
| Update warmup config | Creates or changes a record | no hyreflow credits |
| List blacklist tests | Looks something up | no hyreflow credits |
| List campaign leads | Looks something up | no hyreflow credits |
| List campaigns | Looks something up | no hyreflow credits |
| List do-not-contact | Looks something up | no hyreflow credits |
| List inbox placement tests | Looks something up | no hyreflow credits |
| List leads | Looks something up | no hyreflow credits |
| List mailboxes | Looks something up | no hyreflow credits |
| List warmup stats | Looks something up | no hyreflow credits |
| Get analytics overview | Looks something up | no hyreflow credits |
| Get blacklist test | Looks something up | no hyreflow credits |
| Get campaign | Looks something up | no hyreflow credits |
| Get campaign analytics | Looks something up | no hyreflow credits |
| Get inbox placement test | Looks something up | no hyreflow credits |
| Get mailbox | Looks something up | no hyreflow credits |
| Get mailbox health | Looks something up | no hyreflow credits |
| Get warmup config | Looks something up | no hyreflow credits |
| Get warmup stats | Looks something up | no hyreflow credits |
One credit is priced on the pricing page. The full price list for every tool is in the pricing tables.
Which hyreflow skills use SendKit?
7 hyreflow skills call SendKit as part of the run. A skill is a whole pipeline your agent already knows, end to end.
Check an old email list before it touches your sending domain
use whenyou are about to email a list you did not build this month, such as an old export, a bought list or last year's campaign
Find where your bounced contacts went, and an address that works
use whena campaign came back with bounces, and you want the people behind them found again, not only the dead addresses removed
Screen any outreach list against your off-limits rules before it is loaded
use whena list is about to go into a sequence and you need to be sure no client, no off-limits company, no one in process and no past opt-out is on it
Build an outreach sequence without losing control of the send
use whenyou have the list and now you need a cadence built, loaded and ready, with nothing going out until you say so
Check your sending mailboxes and domain before a campaign goes out
use whena campaign is loaded and ready, and you want to know the mailboxes and the domain behind it are fit to send before you press start
Give the people who never replied a different reason to answer
use whena sequence has finished, most of the list said nothing, and sending the same pitch again is not a plan
How does an AI agent know how to use SendKit?
hyreflow ships a written playbook for SendKit, and the agent loads it before the first call. Auth, rate limits, what each call costs, which actions need your approval, and the mistakes worth avoiding. It is the difference between an agent that knows the tool and one that guesses at it.
Read the SendKit docs →Show the raw playbookwritten for the agent
Use SendKit for outbound email campaign management, plus a deliverability surface most sequencers don't expose: mailbox health, warmup progress, inbox-placement tests and blacklist tests, so you can check a mailbox is ready to send before you load a campaign onto it.
Capabilities
| Tool | Does | Cost |
|---|---|---|
list_campaigns |
List campaigns (resolve a stable campaign ID) | Free |
create_campaign |
Create a campaign (draft — nothing sends yet) | Free |
add_campaign_leads |
Add leads to a campaign (up to 5,000 per call) | Free |
start_campaign |
Start sending (requires a mailbox, a sequence step, a lead) | Free |
get_campaign_analytics |
Sent / opened / clicked / replied / bounced | Free |
list_mailboxes |
List sending mailboxes and their status | Free |
get_mailbox_health |
Health score and bounce rate for one mailbox | Free |
list_warmup_stats |
Warmup progress across all mailboxes | Free |
create_inbox_placement_test |
Send a seed test to check inbox placement | Free |
create_blacklist_test |
Check a mailbox against blacklists | Free |
Guidance
- Check deliverability before you send.
get_mailbox_healthand the warmup endpoints exist so a campaign is loaded onto a mailbox that is actually ready, instead of finding out from the bounce rate afterward. - Gate activation behind enrichment/verification — only push leads that have been validated.
start_campaigntriggers real outbound; confirm the mailbox, sequence, and lead list first. - Resolve campaign IDs from
list_campaignsbefore any write. - Add leads in batches of up to 5,000 per call.
- Auth is a workspace key (
sk_...), created in the SendKit UI. A platform key (sk_user_...) needs a workspace header this integration doesn't send, so it's rejected up front rather than failing silently on the first real call.
hyreflow tools execute sendkit add_campaign_leads \
--payload '{"campaign_id":"campaign_123","leads":[{"email":"[email protected]","firstName":"Ada","companyName":"Acme"}]}'
Questions about SendKit and hyreflow
Can I use SendKit inside Claude or ChatGPT?
Yes. hyreflow is a connector for Claude, ChatGPT and other AI assistants. Once hyreflow is connected, you ask for the outcome in plain language and the assistant calls SendKit for you. hyreflow exposes 36 SendKit actions this way.
Do I need my own SendKit account to use it with hyreflow?
Yes. SendKit runs on your own SendKit account. You connect it to hyreflow once, hyreflow charges no credits for the calls, and SendKit bills you as before.
What does SendKit cost through hyreflow?
SendKit runs on your own SendKit account: hyreflow charges no credits for it, and SendKit bills you as before.
How do I connect SendKit to an AI agent over MCP?
Add the hyreflow MCP server to your assistant and sign in. hyreflow calls the SendKit API directly and exposes its actions as tools the assistant can run, so there is no separate SendKit server to install.
Put SendKit to work from one prompt
Connect hyreflow to Claude or ChatGPT and ask for the outcome. It reads the playbook above before it makes a single call.