sleeper-mcp-server

Sleeper MCP Server is an MCP (Model Context Protocol) server that lets an AI agent query Sleeper Fantasy Football data (e.g., league standings, members, weekly matchups) and apply custom league settings such as head-to-head tiebreaker calculations defined in a local configs/league_settings.json file.

Evaluated Apr 04, 2026 (16d ago)

Repo ↗ Ai Ml mcp fantasy-football sleeper agent-tools tiebreakers standings api-integration go

⚙ Agent Friendliness

/ 100

Can an agent use this?

🔒 Security

/ 100

Is it safe for agents?

⚡ Reliability

/ 100

Does it work consistently?

Score Breakdown

⚙ Agent Friendliness

MCP Quality

Documentation

Error Messages

Auth Simplicity

Rate Limits

🔒 Security

TLS Enforcement

Auth Strength

Scope Granularity

Dep. Hygiene

Secret Handling

TLS/auth, dependency health, and secret handling are not evidenced in the provided README. The server likely fetches data from Sleeper’s API and uses local config; without documentation, assume secrets (if any) may be handled via environment/config and that agent prompt injection risks depend on how the server passes content between the agent and Sleeper endpoints.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

You want an MCP-compatible agent to answer natural-language questions about your Sleeper fantasy leagues and you are comfortable configuring custom standings rules.

Avoid When

You need strongly documented, contract-based APIs (OpenAPI), clear rate-limit semantics, or you require evidence of robust error handling/idempotent design from the provided materials.

Use Cases

• Get current standings for one or more Sleeper fantasy leagues with custom tiebreakers
• List all users/members in a Sleeper league
• Retrieve weekly matchups and results for a given week
• Recompute standings using head-to-head and other custom tiebreaker rules

Not For

• Teams seeking official, guaranteed-accuracy fantasy data tooling without custom-calculation behavior
• Use cases requiring a general-purpose REST/GraphQL/SDK interface outside of MCP workflows
• Environments that cannot run or expose an MCP server process

Interface

REST API

GraphQL

gRPC

MCP Server

Yes

SDK

Webhooks

Authentication

OAuth: No Scopes: No

Authentication details are not present in the provided README. Integration likely depends on Sleeper API access patterns, but no evidence is given here.

Pricing

Free tier: No

Requires CC: No

No pricing information provided; repository appears to be MIT-licensed code.

Agent Metadata

Pagination

none

Idempotent

False

Retry Guidance

Not documented

Known Gotchas

⚠ README does not show concrete tool schemas/tool names, error codes, or retry/idempotency guidance; agents may need to probe behavior during integration.
⚠ Custom standings behavior depends on configs/league_settings.json; malformed configuration could lead to incorrect responses without clear validation/error messaging.

Alternatives

Directly call Sleeper’s public API from your own app and implement tiebreaker logic Use an existing fantasy analytics tool/library that supports custom tie-breaks Build a thin MCP layer around Sleeper API endpoints you need, with your own error/retry and schema validation

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API endpoint ↗ Agent guide ↗ Report inaccuracy

Scores are editorial opinions as of 2026-04-04.