# developer.calendly.com: agentic web grade A+

Score 60 (coverage 40 + breadth 15 + conformance 5); 7 standards observed across 4 of 9 steps; checked 2026-10-25T22:03:16Z. This grades the agent-facing files published at developer.calendly.com, not the organisation's products.

## Manifests

| Manifest | Path | Result | Errors | Warnings |
| --- | --- | --- | --- | --- |
| Agentic Resource Discovery | /.well-known/ard.json | absent HTTP 404 |  |  |
| AI Catalog well-known file | /.well-known/ai-catalog.json | absent HTTP 404 |  |  |
| MCP Server Cards (SEP-2127) | /mcp/server-card | absent HTTP 404 |  |  |
| Agent2Agent Protocol | /.well-known/agent-card.json | absent HTTP 404 |  |  |
| llms.txt | /llms.txt | valid |  | no blockquote summary under the title |
| AGENTS.md | /AGENTS.md | valid |  |  |
| Agent Skills | /.well-known/agent-skills/index.json | valid |  |  |
| api-catalog: A Well-Known URI and Link Relation to Help Discovery of APIs | /.well-known/api-catalog | valid |  |  |
| AI Crawler User-Agent Tokens in robots.txt | /robots.txt | valid |  | no Agentmap: line (optional convention pointing agents at /.well-known/ard.json) |
| security.txt (RFC 9116) | /.well-known/security.txt | absent HTTP 404 |  |  |
| auth.md | /auth.md | errors | none of the auth.md mechanism names found (identity_assertion, service_auth, anonymous) |  |
| Open Knowledge Format | /okf/index.md | errors | missing YAML frontmatter block (--- ... ---); missing okf_version (0.1 or 0.2) in frontmatter (OKF §8) |  |

## Standards observed

- llms.txt: https://developer.calendly.com/llms.txt (https://agenticweb.wiki/protocols/llms-txt/)
- AGENTS.md: https://developer.calendly.com/AGENTS.md (https://agenticweb.wiki/protocols/agents-md/)
- Content Signals Policy: https://developer.calendly.com/robots.txt (https://agenticweb.wiki/protocols/cloudflare-content-signals-policy/)
- api-catalog: A Well-Known URI and Link Relation to Help Discovery of APIs: https://developer.calendly.com/.well-known/api-catalog (https://agenticweb.wiki/protocols/api-catalog-rfc9727/)
- AI Crawler User-Agent Tokens in robots.txt: https://developer.calendly.com/robots.txt (https://agenticweb.wiki/protocols/ai-crawler-tokens-robots/)
- Agent Skills: https://developer.calendly.com/.well-known/agent-skills/index.json (https://agenticweb.wiki/protocols/anthropic-agent-skills-format/)
- Markdown for Agents: https://developer.calendly.com/ (https://agenticweb.wiki/protocols/cloudflare-markdown-for-agents/)

## Cheapest next steps

1. Agentic Resource Discovery: a catalog at /.well-known/ard.json lets agents discover your APIs, MCP servers and data in one fetch (https://agenticweb.wiki/protocols/ard/)
2. security.txt (RFC 9116): RFC 9116 contact and expiry, read by agents and people (https://www.rfc-editor.org/rfc/rfc9116)
3. MCP Server Cards (SEP-2127): if you run an MCP server, a SEP-2127 card at <mcp-url>/server-card lets clients configure themselves (https://agenticweb.wiki/protocols/mcp-server-cards/)

Published a manifest or spotted a path we missed? Submit at https://agenticweb.wiki/submit/ or email mailto:info@belgravialabs.com?subject=Manifest%20or%20correction%20for%20developer.calendly.com.

## Agent pre-flight & practical readiness

Preferred mode: `openapi` (fallback `agent_skills`). Read the published API description and call those operations. Scraping HTML skips the interface the site already gave you.

Fetch: `GET https://developer.calendly.com/openapi/calendly-api.yaml` GET the API description and call the documented operations.

Practical readability: exa_parsable yes, markdown negotiation yes, render `markdown_native`, HTML quality `high`, first content at byte 0.

AI crawler posture: `search_allowed_training_blocked` · Assistant access: OpenAI `allowed`, Anthropic `allowed`, Google `allowed`, Perplexity `allowed`, Exa `allowed`.

Readiness subscores: reach 14/20, readability 28/30, capabilities 19/35, conformance 5/15, total 66/100, grade A.

## Rubric

+10 per lifecycle step with a standard observed, counting manifests that validate or that the probe rule for the standard recognises (a valid MCP server card counts for MCP; max 90); +3 per observed standard beyond the first two (max 15); conformance +15 (+10 with one manifest) minus 5 per agent-facing manifest with errors, never below 0 (security.txt is reported, not scored). Lifecycle grade: A+ >= 60, A >= 45, B >= 30, C >= 20, D >= 10. Strict 100-point composite (subscores.total_100 / subscores.grade_100): reach_and_policy (20) + readability (30) + capabilities (35) + conformance (15), where A+ >= 80, A >= 65, B >= 45, C >= 28, D >= 15.

JSON: https://agenticweb.wiki/check/developer.calendly.com/index.json · badge: https://agenticweb.wiki/badge/developer.calendly.com.svg