Datasets:

evalstate
/

mcp-clients

configs:
  - config_name: deduplicated
    data_files:
      - split: deduplicated
        path: deduplicated/deduplicated-*
  - config_name: raw
    data_files:
      - split: raw
        path: raw/raw-*
license: mit
tags:
  - code
  - agent
size_categories:
  - 1K<n<10K
dataset_info:
  - config_name: deduplicated
    features:
      - name: name
        dtype: string
      - name: versions
        dtype: string
      - name: capabilities
        dtype: string
      - name: last_seen
        dtype: string
    splits:
      - name: deduplicated
        num_bytes: 42315
        num_examples: 425
    download_size: 19027
    dataset_size: 42315
  - config_name: raw
    features:
      - name: name
        dtype: string
      - name: version
        dtype: string
      - name: capabilities
        dtype: string
      - name: last_seen
        dtype: string
    splits:
      - name: raw
        num_bytes: 117744
        num_examples: 1375
    download_size: 35066
    dataset_size: 117744

MCP Clients Dataset

This data contains MCP Client identity and capability information logged by the MCP Server at huggingface.co/mcp.

The data is updated daily (~4AM UTC), and represents the last ~7m sessions.

Dataset Contents

The dataset contains two configurations, raw and deduplicated.

Raw contains distinct (name,version,capabilities) and a timestamp of the latest that distinct configuration was seen.

Deduplicated removes mcp-remote suffixes, groups by distinct (name,capabilities), concatenates the version numbers found and retains the last_seen timestamp. Note that further post-processing may be added to handle specific clients such as postman.

Raw Split (`raw`)

name: MCP client name (e.g., "Cursor", "Anthropic/ClaudeAI", "chat-ui-mcp")
version: Client version
capabilities: Client capabilities (JSON string)
last_seen: Most recent timestamp when this distinct client configuration was seen

Deduplicated Split (`deduplicated`)

name: MCP client name (normalized, mcp-remote suffix stripped)
versions: All versions seen for this client (comma-separated)
capabilities: Client capabilities (JSON string)
last_seen: Most recent timestamp when this distinct client configuration was seen

Notes about the Data

Some Clients only send capabilities that have been configured (for example, fast-agent only sends the roots capability if roots are configured)
There are a number of capabilities out of specification that are helpful to track (e.g. MCP-UI, Skybridge, Apps SDK). We encourage the use of experimental to advertise these capabilities for tracking.
The deduplicated split groups clients by (name, capabilities), concatenating all versions together.
The Protocol Version not currently captured - future datasets may include this

Usage

from datasets import load_dataset

# Load raw clients
raw_ds = load_dataset('evalstate/mcp-clients', 'raw')
for client in raw_ds['raw']:
    print(f"{client['name']} v{client['version']}")

# Load deduplicated clients
dedup_ds = load_dataset('evalstate/mcp-clients', 'deduplicated')
for client in dedup_ds['deduplicated']:
    print(f"{client['name']}: {client['versions']}")

Updating the Dataset

The dataset is kept up-to-date via Hugging Face Jobs:

Extract step (raw split):

uv run https://huggingface.co/datasets/evalstate/mcp-clients/resolve/main/extract_mcp_clients.py --push-to-hub --split raw

Deduplicate step (deduplicated split):

uv run https://huggingface.co/datasets/evalstate/mcp-clients/resolve/main/deduplicate_clients.py --push-to-hub

Or run the full pipeline:

uv run https://huggingface.co/datasets/evalstate/mcp-clients/resolve/main/pipeline.py

License

MIT