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nullary

MCP serverDev tools

nullary gives your AI access to negative results intelligence for drug discovery. Once added, your AI can query measured failures, so you can learn from experiments that did not work instead of repeating them.

Use nullary in Claude, ChatGPT or Ahel Desktop

Free. Sign in, add nullary and connect your AI. About a minute.

ClaudeChatGPTAhel Desktop

Also: Claude Code · Cursor · Codex

Then ask your AI: use nullary to search inactive compounds

Details

Available today. Use it from your connected AI after setup.

After adding nullary, ask your AI to look up measured failures related to your drug discovery question. Source code is available at github.com/nullary-ai/nullary.

nullaryStart free

What your AI can do with it

  • Search measured failures from drug discovery experiments
  • Query negative results for a research question
  • Look up what has already been tried and did not work
  • Pull failure data to review before planning new experiments

Install nullary

The server’s own address, for the clients that take one directly. Or connect Ahel once and every client you use reads it from one address, with the account kept on Ahel rather than in each client’s config.

  • Claude Code

    claude mcp add --transport http --scope user nullary 'https://mcp.nullary.ai/mcp'

    Run it once in your project, then open /mcp to approve any sign-in the server asks for.

  • Claude Desktop

    https://mcp.nullary.ai/mcp

    Add a custom connector in Settings, paste this address, and approve the sign-in.

  • Cursor

    cursor://anysphere.cursor-deeplink/mcp/install?name=nullary&config=eyJ1cmwiOiJodHRwczovL21jcC5udWxsYXJ5LmFpL21jcCJ9

    Open the link and Cursor adds the server at that address.

  • ChatGPT

    https://mcp.nullary.ai/mcp

    In Settings, enable Developer mode, create an MCP app, and paste this address. Your plan and workspace must allow custom apps.

  • Codex

    codex mcp add nullary --url 'https://mcp.nullary.ai/mcp'

    Run it once, then sign in with codex mcp login nullary if the server asks for an account.

Tools it offers (35)

What this server listed when Ahel dialed its public endpoint in Oct 2026, with no key and no account of yours. The names are the server’s own.

  • search_inactive_compounds
  • search_failed_selectivity
  • search_admet_failures
  • search_failed_guides
  • search_failed_essentiality_screens
  • search_ancestry_specific_failures
  • search_developability_failures
  • search_failed_clinical_antibodies
  • search_failed_peptide_therapeutics
  • search_peptide_stability_issues
  • search_failed_protacs
  • search_protac_e3_issues
  • search_failed_oligonucleotides
  • search_oligo_delivery_failures
  • search_failed_vaccines
  • search_vaccine_immunogenicity_failures
  • search_failed_adcs
  • search_adc_linker_failures
  • search_failed_bispecifics
  • search_bispecific_format_failures
  • search_admet_failures_all_modalities
  • search_drug_drug_interaction_failures
  • search_mechanism_failures
  • search_failed_replications
  • search_safety_failures
  • search_target_history
  • search_indication_history
  • search_pathogen_history
  • get_compound
  • get_finding_provenance
Advanced
Delivery
nullary MCP server → your Ahel connector (mcp.ahel.ai) → your AI.
Item type
mcp-server
Key
ai-nullary-nullary
Source
github.com/nullary-ai/nullary
Hosted endpoint
https://mcp.nullary.ai/mcp

github.com/nullary-ai/nullary

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