The Stack Index / Action Surface / Slack
Action Surface · serves Motion
Slack
Slack is used in the action surface layer by 5 operators documented on GTM Vault, including Alexander Shartsis, Skyp, where it ran as the notification and alerting layer over MCP.
Who named it, and what it did
One entry per episode. Mentions in passing, sponsor reads and guest biographies are not counted.
Notification and alerting layer over MCP
Operator evidence · SMYS 2MCPs vs APIs in a Production Enrichment PipelineThe episode →
Amos Bar-JosephSwan AIInterface the agent runs through
Operator evidence · GTM 16AI Should Augment Sellers, Not Replace ThemThe episode →
Umar Farooq AdamHitachi VantaraRep notification fired by Outreach activity webhooks
Operator evidence · SMYS 5From Account List to Monitoring Universe: Building the Prioritization LayerThe episode →
Angelo QuiambaoIntellistackPrevious role at Qualified: natural-language trigger for the query agent where reps work in Slack
Operator evidence · SMYS 7Your Reps Should Never Meet Your AgentsThe episode →
Michael BartimerClarifyWebsite Visitors channel, visibility as step one of the play
Operator evidence · SMYS 9The First Thing a Signal Agent Does Is Throw Signal AwayThe episode →
Run the system yourself
PQL scoring and routing agentFree Claude skill, built from Michael Bartimer’s system on SMYS 9 →Account monitoring universeFree Claude skill, built from Umar Farooq Adam’s system on SMYS 5 →MCP and API enrichment pipelineFree Claude skill, built from Alexander Shartsis’s system on SMYS 2 →Agents behind the repFree Claude skill, built from Angelo Quiambao’s system on SMYS 7 →For the Slack team
5 operators put Slack on the record.
Each operator above described Slack running inside a working revenue system, in their own words, one citation per episode. The record is yours to share.
Placement, order and counts are never for sale. How the index works.
Share the record
Free. It states the count and nothing else, and updates itself, so it can go down as well as up. The only condition is that it links back to this page.
Add a customer
Put a customer forward for Show Me Your StackA customer walks through the system they built with Slack. If it holds up, it goes on the record.
See which stacks this tool shows up in next
Every Show Me Your Stack episode adds operators and tools to this index. Subscribe to GTM Vault and get each one as it lands.
Runs alongside
Tools that appear in the same operators’ stacks as Slack. The count is how many of those operators run both.
Others in action surface
Common questions
- Which operators use Slack?
- 5 operators on GTM Vault have described running Slack in a working system: Alexander Shartsis (Skyp), Amos Bar-Joseph (Swan AI), Umar Farooq Adam (Hitachi Vantara), Angelo Quiambao (Intellistack) and Michael Bartimer (Clarify). Each entry is one citation per episode, in the operator's own words. Alexander Shartsis, Skyp described it as the notification and alerting layer over MCP (SMYS 2).
- What layer of revenue architecture does Slack serve?
- Slack is placed on the Action Surface layer, which serves Motion in the eight-layer model of revenue architecture. Where the rep or agent works, and where sends actually go out. Placement follows the job the tool did in an operator's system, not the category its marketing claims.
- What runs alongside Slack?
- In the stacks of operators who run Slack, the tools that appear most often are Claude Code (3), Apollo (2), Clay (1), Instantly (1) and HubSpot (1). The number is how many of those operators run both.
- What entry tier is Slack?
- Slack is listed at the mid-market tier. The index records budget as a posture (self-serve, mid-market, enterprise), not a price, because public pricing in this category is unreliable.