Capabilities observed in traffic

Generated from data/observed/hf-mcp-clients.json: evalstate/mcp-clients at c30d6f28, report generated 2026-11-09, window 2026-09-10 to 2026-11-08. 12 clients, 4 with a registry entry.

A flag is set when more than 50% of a client's 2026-07-28 tool calls in the window declare the capability, or when a backfill has it. The initialize-era backfill (2026-06-07 to 2026-07-26) can set elicitation, elicitation_url, mcp_apps for a client even though it lies outside the window. Where a backfill could have set a flag the At column is ?, because the report does not say which path did. skills is set by a successful skills/list call, so an unset skills flag is not recorded as unsupported. A client with no 2026-07-28 traffic in the window gets no record for an unset flag.

Client	Wire names	Tool calls by revision, 30d	elicitation	elicitation.url	apps	tasks
Claude Code	`claude-code`	`2026-07-28` 99.2%, `2025-11-25` 0.8%, `2025-06-18` <0.1%, `2025-03-26` <0.1%	● ?	●	○	○
Claude.ai	`Anthropic/ClaudeAI`	`2026-07-28` 99.7%, `2025-11-25` 0.3%	○	○	● ?	○
Codex CLI	`codex-mcp-client`	`2026-07-28` <0.1%, `2025-06-18` 100%	● ?	● ?	●	○
Codex Desktop	`openai-mcp (Codex)`	`2026-07-28` 96.5%, `2025-11-25` 3.5%	●	●	● ?	○
OpenAI ChatGPT	`openai-mcp`	`2026-07-28` 46.2%, `2025-11-25` 53.8%	○	○	● ?	○
Hugging Face ChatUI	`chat-ui-mcp`	`2026-07-28` 100%	●	●	○	○
OpenCode	`opencode`	`2026-07-28` <0.1%, `2025-11-25` 99.9%, `2025-03-26` <0.1%, `2024-11-05` <0.1%	●	●	○	○
Cursor	`Cursor`, `Cursor MCP Availability`, `cursor-agent`, `cursor-check`, `cursor-diag`, `cursor-hf-check`, `cursor-mcp-sync-check`, `cursor-public-preflight`, `cursor-test`, `cursor-vscode`	`2025-11-25` 99.9%, `2025-06-18` <0.1%, `2025-03-26` <0.1%, `2024-11-05` <0.1%	● ?		● ?
Visual Studio Code	`Visual Studio Code`, `Visual Studio Code - Insiders`	`2025-11-25` 100%	● ?	● ?	● ?
Llama UI	`llama-ui-mcp`	`2025-11-25` 100%	○	○	○	○
fast-agent	`fast-agent-mcp`	`2026-07-28` 100%	● ?	● ?	○	○
Antigravity	`Antigravity`, `Antigravity-Client`, `antigravity`, `antigravity-client`	`2026-07-28` 97.3%, `2025-11-25` 2.1%, `2025-03-26` <0.1%, `2024-11-05` 0.6%	● ?	● ?	○	○

● set, observed at 2026-07-28 · ● ? set, revision unknown · ○ not set · blank: no record.

Policy

The source's policy block, verbatim.

{
  "capability_backfill_path": "reports/dashboard-capability-backfill-v1.json",
  "capability_proportion_threshold": 0.5,
  "elicitation_historical_source": "initialize.capabilities.elicitation",
  "elicitation_request_source": "clientCapabilities.elicitation",
  "elicitation_url_historical_source": "initialize.capabilities.elicitation.url",
  "elicitation_url_request_source": "clientCapabilities.elicitation.url",
  "everything_else_historical_qualification": "legacy tool calls in immutable initialize backfill window",
  "everything_else_minimum_tool_calls": 1000,
  "everything_else_request_qualification": "valid-protocol tool calls in report window",
  "historical_capability_limit": [
    "elicitation",
    "elicitation_url",
    "mcp_apps"
  ],
  "mcp_apps_historical_source": "initialize.capabilities.extensions.io.modelcontextprotocol/ui",
  "mcp_apps_request_source": "clientCapabilities.extensions.io.modelcontextprotocol/ui",
  "mcp_remote_policy": "excluded",
  "modern_protocol_version": "2026-07-28",
  "skills_observation_source": "successful client-originated skills/list transport metrics",
  "valid_protocol_versions": [
    "2024-11-05",
    "2025-03-26",
    "2025-06-18",
    "2025-11-25",
    "2026-07-28"
  ]
}

Generated from data/observed/*.json by scripts/build-cards.js. Rerun npm run ingest:observed and npm run build:cards, do not edit this file.