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ChEMBL
hcls.mcp.claude.com/chembl/mcp
Excellent
Protocol
Tools
All tools have descriptions
All tools have non-empty descriptions
All tools have OpenAI behavior hints
All tools declare the three OpenAI behavior hints as booleans
Tool names use valid characters
All tool names use valid characters
Tool names follow the MCP 1–128 character range
All tool names follow the MCP recommended length
Tool input schemas have a valid object structure
All tool input schemas have a valid object structure
Tool names follow MCP uniqueness guidance
All tool names are unique
Declared output schemas have a valid basic structure
6 declared output schema(s) pass basic structural validation; schemas may describe any JSON value, including arrays
Tool-linked resource URI is readable
No view resources found — view checks skipped
Tool text has no hidden control characters
No invisible or control characters found in tool-facing text
Tool visibility metadata is valid
No view resources found — view checks skipped
Tool input header annotations are valid
All x-mcp-header annotations satisfy Streamable HTTP requirements
Tool invocation metadata present
No view resources found — view checks skipped
MCP Apps
View resources declare a domain
No view resources found — view checks skipped
Declared domains respond
No view resources found — view checks skipped
View resource metadata complete
No view resources found — view checks skipped
View resource envelope is valid
No view resources found — view checks skipped
All discovered view resources were inspected
No view resources found — view checks skipped
CSP metadata covers literal external origins
No view resources found — view checks skipped
Client compatibility
Claude Code metadata fits its 2 KB fields
7 metadata field(s) exceed Claude Code's 2 KB truncation point
How to fix: Keep each tool description and the server instructions field at or below 2 KB, and put critical guidance first.
Claude tools declare applicable behavior hints
All tools include an applicable readOnlyHint or destructiveHint
Cursor tool-name budget advisory
No tool name independently exhausts Cursor's observed 60-character combined budget
Skills over MCP resources are readable
Server does not advertise the Skills over MCP extension
Claude tool names are within 64 characters
All tool names are within Claude's 64-character limit
ChatGPT tool names are unique
All tool names are unique
All tools have a display title
All tools have a display title
OpenAI file parameters use valid schemas
All declared OpenAI file parameters use reviewer-valid schemas
Overview
- Author
- Anthropic
- Verification
- anthropic
- Auth
- None — public endpoint
- Categories
- life-sciences
- Works with
- claudeclaude-code
- Docs
- Documentation
get_admetget_bioactivitycompound_searchdrug_searchget_mechanismtarget_searchRelated MCP servers
FAQ
ChEMBL install, tools, readiness, and alternatives.
How do I add ChEMBL to Claude, ChatGPT, or Cursor?
Add ChEMBL to Claude, ChatGPT, or Cursor by connecting its remote MCP URL in each client's MCP settings. In Claude, add a custom connector. In ChatGPT, add an MCP app. In Cursor, add an MCP server under Settings. The MCP URL is https://hcls.mcp.claude.com/chembl/mcp.
Is ChEMBL MCP ready for ChatGPT and Claude?
As of September 15, 2026, ChEMBL scores 96/100 on Manufact's MCP publishing checklist. The scan meets ChatGPT publishing checks and meets Claude publishing checks.
What tools does the ChEMBL MCP server provide?
ChEMBL provides these MCP tools: get_admet, get_bioactivity, compound_search, drug_search, get_mechanism, and target_search.
What are the best alternatives to ChEMBL?
As of September 15, 2026, alternatives to ChEMBL in life-sciences on the Manufact MCP catalog include bioRxiv, Clinical Trials, PubMed, and Open Targets.
Does ChEMBL MCP require authentication?
ChEMBL does not require authentication. It is a public MCP endpoint you can connect without logging in.
Who develops ChEMBL?
ChEMBL is developed by Anthropic. It is listed as anthropic on the Claude connector directory.
Not your MCP?
Scan any public or OAuth MCP URL against ChatGPT and Claude publishing checks. No account required.