# VirtualFlyBrain (slim)

> VirtualFlyBrain, an MCP server by virtualflybrain.org, listed from the official MCP registry. Indexed, not reviewed: facts and our own checks, no score or ranking. MCP server for Drosophila neuroscience data from VirtualFlyBrain

- Full: https://www.anchorterminal.com/tools/virtualflybrain-vfb3-mcp.md (~1,300 tokens) · this version ~1,230 tokens · JSON https://www.anchorterminal.com/tools/virtualflybrain-vfb3-mcp.json · canonical https://www.anchorterminal.com/tools/virtualflybrain-vfb3-mcp
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

# VirtualFlyBrain

> Indexed, not reviewed: facts from the official MCP registry and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/

- Kind: MCP server, by virtualflybrain.org (https://virtualflybrain.org)
- Listed because: It's published in the registry under virtualflybrain.org, a namespace the registry only gives to whoever proves they control that domain.
- What the official MCP registry says: MCP server for Drosophila neuroscience data from VirtualFlyBrain

## Facts

- MCP registry: `org.virtualflybrain/vfb3-mcp` 1.11.2
- Endpoint: https://vfb3-mcp.virtualflybrain.org (streamable HTTP)
- Source: https://github.com/VirtualFlyBrain/VFB3-MCP
- Website: https://virtualflybrain.org
- GitHub stars: 9
- Registry entry updated: 2026-09-10

## Tools

- Tools it lists (11, about 5,957 tokens of context, `tools/list` without credentials over MCP 2025-11-25, checked 2026-10-04 22:25 UTC):
  - `get_term_info`: Get term info for a VFB or anatomy ontology entity (VFB_*, FBbt_*, etc.). THIS IS THE QUERY DISCOVERY TOOL: the response's "Queries" array lists the valid…
  - `run_query`: Run a pre-computed query on a VFB entity. REQUIRED WORKFLOW: (1) call get_term_info on the ID first; (2) read the response's "Queries" array; (3) pass one of…
  - `search_terms`: Search VFB terms. This is the search virtualflybrain.org itself runs — the same Solr query, the same ranking — so what comes back first here is what a user…
  - `list_search_facets`: List the type names search_terms can filter, exclude, boost or demote by, with the number of terms carrying each one. Call this instead of guessing: there are…
  - `resolve_entity`: Resolve an unresolved FlyBase-related query string into VFB/FlyBase IDs and metadata. Pass the raw text exactly as the user wrote it (for example…
  - `resolve_combination`: Resolve an unresolved split-GAL4 combination name or synonym into its FBco ID and component hemidrivers. Pass the raw combination text exactly as the user…
  - `list_connectome_datasets`: List available connectome datasets with their labels and symbols. Use the returned symbols when constructing exclude_dbs arguments for query_connectivity.…
  - `query_connectivity`: Query synaptic connectivity between Drosophila neuron classes across ALL connectome datasets simultaneously for comparative connectomics. This is NOT…
  - `get_predicted_neurotransmitters`: Get the PREDICTED neurotransmitter(s) for a Drosophila neuron class — itself or any subclass — from per-instance connectome predictions (each reconstructed…
  - `get_known_neurotransmitters`: Get the KNOWN (curated) neurotransmitter(s) for a Drosophila neuron class and its subclasses, from the ontology's classification rather than per-instance…
  - `get_hierarchy`: Build a hierarchy tree for a VFB term, showing ancestors (parents) and/or descendants (children). Use relationship "part_of" for brain region structure (e.g.…
- How its tools read to an agent (0 errors, 15 warnings, 1 note, about 5,957 tokens; rules at https://www.anchorterminal.com/check.md; not part of the score):
  - warn TC07 query_connectivity: the description is about 566 tokens
  - warn TC07 run_query: the description is about 551 tokens
  - warn TC07 search_terms: the description is about 649 tokens
  - warn TC14 query_connectivity: allowed values are in the description, not an enum: upstream_type
  - warn TC16 get_hierarchy: no readOnlyHint or destructiveHint
  - warn TC16 get_known_neurotransmitters: no readOnlyHint or destructiveHint
  - warn TC16 get_predicted_neurotransmitters: no readOnlyHint or destructiveHint
  - warn TC16 get_term_info: no readOnlyHint or destructiveHint
  - warn TC16 list_connectome_datasets: no readOnlyHint or destructiveHint
  - warn TC16 list_search_facets: no readOnlyHint or destructiveHint
  - warn TC16 query_connectivity: no readOnlyHint or destructiveHint
  - warn TC16 resolve_combination: no readOnlyHint or destructiveHint
  - warn TC16 resolve_entity: no readOnlyHint or destructiveHint
  - warn TC16 run_query: no readOnlyHint or destructiveHint
  - warn TC16 search_terms: no readOnlyHint or destructiveHint
  - note TC24 server: 11 of 11 tools have no outputSchema

- JSON: https://www.anchorterminal.com/api/v1/tools/virtualflybrain-vfb3-mcp.json
- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming