# Heystack (heystacks.com)

Lets people and automated agents collaboratively write and revise shared spreadsheets and documents in one place.

- Atlas card: https://inite.ai/en/atlas/heystacks.com
- Site: https://heystacks.com
- For: people and AI agents co-writing shared markdown documents and spreadsheets
- Categories: data
- Use 0/100 · alive 79/100

## Used for

- publish how-to guides as shared markdown documents
- track lists and reference data in markdown spreadsheets
- let AI agents read and edit shared documents

## Price

Not read yet.

## For developers

- OpenAPI: https://heystacks.com/openapi.json (14 paths)
- MCP server: com.heystacks/heystack (namespace; open on 2026-10-27, 17 tools)
- Read 2026-10-27

## MCP server, measured daily

Server: https://heystacks.com/mcp, checked every day since 2026-10-27 (1 checks).

- Answered: measuring, 1 daily checks so far
- Median first answer: 262 ms
- Sign-in: none
- Context its tool definitions take: about 3804 tokens (17 tools)
- Tool definitions: B, 84/100
- Failing "params_described": 16 of 17 tools
- Warning "open_writes": create_markdown, create_spreadsheet, edit_markdown, edit_spreadsheet, suggest_edit
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Read 2026-10-27

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Source: INITE Atlas, https://inite.ai/en/atlas/heystacks.com. JSON: https://inite.ai/api/atlas/heystacks.com. MCP: https://inite.ai/api/mcp (atlas_lookup).