TheRundown Data MCP

Capture multiplexed live sports data

capture_live_stream

Read-onlyIdempotent

Read actual multiplexed WebSocket markets, scores, plays, stats, live game state, futures or hedge frames. Supports scoped subscriptions and supported snapshot, resync, usage and unsubscribe controls; only plays supports durable resume. Stats needs a REST baseline. Requires each channel entitlement; priced channels also need all periods, live/player-prop access and no delay. Restricted custom plans can use REST. At most three subscriptions, five seconds of observation, 50 messages and 256 KiB; the socket then closes. No continuous feed or automatic reconnect; report incomplete snapshot/replay and gaps.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "subscriptions": "<subscriptions>"
    },
    "name": "capture_live_stream"
  }
}

Input Schema

Name	Required	Description	Default
`actions`	No
`max_frames`	No
`duration_ms`	No
`subscriptions`	Yes

Output Schema

Name	Required	Description	Default
`gaps`	No
`plan`	No
`error`	No
`usage`	No
`frames`	No
`status`	No
`message`	No
`event_id`	No
`incomplete`	No
`resync_ack`	No
`source_url`	No
`started_at`	No
`duration_ms`	No
`finished_at`	No
`retry_after`	No
`stop_reason`	No
`limit_reason`	No
`retrieved_at`	No
`commands_sent`	No
`required_plan`	No
`received_bytes`	No
`filtered_frames`	No
`received_frames`	No
`resume_complete`	No
`remaining_points`	No
`persistent_stream`	No
`snapshot_complete`	No
`missing_entitlement`	No
`monthly_remaining_points`	No

Schema Changelog

Changes observed during successful MCP inspections.

AddedOct 5, 2026

TDQS

A4.1/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Goes well beyond the annotations: hard limits (three subscriptions, five seconds, 50 messages, 256 KiB), socket closure, no continuous feed or auto-reconnect, durable resume only for plays, and the instruction to report incomplete snapshot/replay and gaps. These are exactly the operational traits an agent needs and that readOnlyHint/idempotentHint cannot convey.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with what is read, then constraints. Information-dense with no filler, though the middle sentences are long and run-on, which slightly hurts scannability. Every sentence carries load-bearing content.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a complex streaming capture tool with an output schema available, the description covers the capability, entitlements, hard limits, termination behavior, and failure reporting. Return-value explanation is rightly omitted because an output schema exists. Only deep per-field subscription semantics remain thin, which is a minor gap.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must carry parameter meaning. It partially does: it maps subscriptions, the action verbs (snapshot, resync, usage, unsubscribe), resume-for-plays, and the limits that correspond to max_frames (50) and duration_ms (5000). However, the many nested subscription filter fields (event_ids, market_ids, participant_ids, sequences, etc.) get no explanation, leaving a substantial gap.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a clear verb (Read) and resource (multiplexed WebSocket markets, scores, plays, stats, live game state, futures, hedge frames), enumerating the channel surface. This distinguishes it from siblings like capture_market_stream and capture_hedge_stream, though it never explicitly names those alternatives to sharpen the boundary.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives concrete preconditions for use: per-channel entitlement, and for priced channels all periods, live/player-prop access and no delay. It also points to an alternative path ('Restricted custom plans can use REST') and notes stats needs a REST baseline. It stops short of naming a specific sibling tool to use instead.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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