# datadef.io — software development services — 2 of 5

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> Probe-verified (tier 2 of 3). Last checked 2026-09-26. 2 of 5 capability checks passed. 2 unknown.

- host: datadef.io
- url: https://datadef.io/
- category: software development services
- type: business
- language: en

## Probe-verified · tier 2 of 3

Probed live on 2026-09-26 against rubric v1.2. 2 of 5 checks passed. 2 unknown.

- UNKNOWN — Markdown negotiation (`Accept: text/markdown`)
- UNKNOWN — Markdown twin at a predictable URL (`/page.md`)
- PASS — llms.txt (`/llms.txt`)
- FAIL — API catalog (`RFC 9727`)
- PASS — MCP endpoint answers tools/list (`initialize → tools/list, no credentials`) · on 26 Sep 2026
  - PRESENT — MCP server card (`/.well-known/mcp/server-card.json`): present; its server answers; not scored
  - Platform-supplied: no; not scored
- PASS — Other agent files at well-known paths (`agent-skills/index.json · oauth-authorization-server · oauth-protected-resource · http-message-signatures-directory`): found: OAuth authorization server metadata, OAuth protected resource metadata; not scored

MCP tools (from tools/list on 2026-09-26): get_design_guide, canvas_describe_canvas, canvas_inspect_nodes, canvas_measure_canvas, canvas_suggest_simplifications, canvas_search_icons, canvas_add_nodes, canvas_add_standalone_node, canvas_update_nodes, canvas_replace_node, canvas_remove_nodes, canvas_connect_nodes, canvas_update_edges, canvas_disconnect_nodes, canvas_set_columns, canvas_group_nodes, canvas_move_to_group, canvas_add_lineage, canvas_add_text, canvas_add_shape, canvas_add_flow_arrow, canvas_add_region, canvas_move_nodes, canvas_resize_nodes, canvas_align_nodes, canvas_collapse_nodes, canvas_layout_canvas, canvas_validate_canvas, create_diagram, create_blank_diagram, list_diagrams, get_diagram, edit_diagram, export_diagram, repo_status, repo_refresh

## Summary

Web-based AI-native tool generating editable data and cloud architecture diagrams from plain English or connected git repositories, supporting typed nodes, column-level lineage, zones, labeled edges, and real cloud service icons, with live embeds and MCP server integration.

## Context

2370 sites in this index share the category "software development services"; 246 are transactional.

## How we grade

- tier 1 — **Declared**: The site says agents are welcome in its robots.txt. A permission, not a capability.
- tier 2 — **Probe-verified** (this site): We fetched the site and tested each signal ourselves. Dated, repeatable, re-checked on a schedule.
- tier 3 — **Behaviourally verified**: An agent completed the action end to end — booked, bought, submitted — and it worked.

## About this record

Known Good probes sites live and publishes what was tested and when.
Method: https://knowngood.sh/about.md · Rubric: https://knowngood.sh/benchmark

How we found this site: probe discovery. This site didn't declare agent access — we found it by checking the open web. Everything above was tested the same way, against the same rubric, on the date shown. [How we choose what to check, and how to opt out](https://knowngood.sh/bot)

## Where this sits

- business: https://knowngood.sh/type/business
- software development services: https://knowngood.sh/category/software-development-services
- AI agents (also in): https://knowngood.sh/category/ai-agents
- developer platforms (also in): https://knowngood.sh/category/developer-platforms
- Browse: https://knowngood.sh/browse
- Rubric: https://knowngood.sh/benchmark