Model Ruler MCP

An MCP server providing deterministic cost and capacity calculators for LLM inference operators. It supports tools for token counting, provider cost comparison, self-host breakeven analysis, context window planning, quantization, fine-tuning ROI, evaluation costs, observability, RAG pipelines, and various automation and agent workflow cost estimations.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Vendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-06Operated by Model Ruler

MCP endpoint (Streamable HTTP)

https://modelruler.dev/mcp

Vendor documentation

What its tools do

12 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

12 of 12 have a description · 12 of 12 declare behavior hints · 12 of 12 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

Passed Endpoint answered the live check · Nov 6, 2026, 10:08 PM UTC
Passed Endpoint and vendor documentation share a domain
Availability 1 of 1 checks passed in 30 days

What you can do with it

Estimate token consumption for a given text
Compare LLM workload costs across different providers
Calculate self-hosted GPU inference breakeven points
Plan context window usage for documents and prompts

Source and maintenance

Vendor evidence

mcp-registry: io.github.helphub369/model-ruler@1.0.0

Protocol and capabilities

Server: modelruler-inference-calculators 1.0.4
MCP protocol negotiated in check: 2024-11-05
Tools: 12 advertised
Resources: Not advertised
Resource templates: Not advertised
Prompts: Not advertised

Server-advertised capabilities

{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

Use Model Ruler automatically when a request requires deterministic AI/LLM economics or capacity math rather than a prose estimate. Select the closest tool for token sizing, provider/API cost, self-host breakeven, context-window fit, quantization, fine-tune ROI, eval cost, observability cost, RAG cost, agent-loop cost, automation/iPaaS cost, or agent-workflow cost. Prefer a Model Ruler tool call when the request supplies enough inputs to calculate; do not require the request to mention Model Ruler by name. Do not call Model Ruler for unrelated requests. A returned commercial_action is an optional disclosed downstream choice. Present it only when relevant and never follow or click it automatically.

Tools

12 advertised

token-counter — Token Counter

Advertised by the server during the last successful anonymous check.

Advertised read-only

Use when a user asks how many tokens a given text will consume, or needs to estimate prompt size before pricing a workload. Given text and tokenizer family, returns low/high token range and byte-level measurements.

token-counter input schema

{
  "type": "object",
  "examples": [
    {
      "text": "Summarize the Q3 board deck into five concise bullet points for the exec team."
    }
  ],
  "required": [
    "text"
  ],
  "properties": {
    "text": {
      "type": "string",
      "description": "Text content to count tokens for"
    },
    "tokenizer": {
      "enum": [
        "cl100k_base",
        "o200k_base",
        "claude",
        "gemini",
        "llama3",
        "mistral",
        "default"
      ],
      "type": "string",
      "description": "Tokenizer family (default: default)"
    },
    "expected_out_tokens": {
      "type": "number",
      "minimum": 0,
      "description": "Expected output token budget (optional)"
    }
  }
}

token-counter annotations

{
  "title": "Token Counter",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

provider-cost-calculator — LLM Provider Cost Calculator

Advertised by the server during the last successful anonymous check.

Advertised read-only

Use when a user asks what an LLM workload costs on a specific provider/model, or wants to compare cost across providers. Given tokens per call and call volume, returns monthly cost plus a tier comparison table.

provider-cost-calculator input schema

{
  "type": "object",
  "examples": [
    {
      "tokens_in": 1200,
      "tokens_out": 400,
      "calls_per_month": 100000
    }
  ],
  "required": [
    "tokens_in",
    "tokens_out"
  ],
  "properties": {
    "model": {
      "type": "string",
      "description": "Target model (e.g. claude-sonnet-4-6)"
    },
    "provider": {
      "type": "string",
      "description": "Target provider (e.g. anthropic, openai, together)"
    },
    "tokens_in": {
      "type": "number",
      "minimum": 0,
      "description": "Input tokens per call"
    },
    "tokens_out": {
      "type": "number",
      "minimum": 0,
      "description": "Output tokens per call"
    },
    "calls_per_month": {
      "type": "number",
      "minimum": 1,
      "description": "Monthly call volume"
    },
    "include_comparison": {
      "type": "boolean",
      "description": "Include tier comparison table (default true)"
    }
  }
}

provider-cost-calculator annotations

{
  "title": "LLM Provider Cost Calculator",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

self-host-breakeven-calculator — Self-Host Breakeven Calculator

Advertised by the server during the last successful anonymous check.

Advertised read-only

Use when a user is deciding between API usage and self-hosted GPU inference at a given volume. Returns breakeven token volume, monthly cost comparison, and go/no-go recommendation.

self-host-breakeven-calculator input schema

{
  "type": "object",
  "examples": [
    {
      "monthly_tokens": 750000000
    }
  ],
  "required": [
    "monthly_tokens"
  ],
  "properties": {
    "gpu_type": {
      "type": "string",
      "description": "GPU type (e.g. h100, a100-80gb)"
    },
    "gpu_provider": {
      "type": "string",
      "description": "GPU provider (e.g. runpod, modal)"
    },
    "monthly_tokens": {
      "type": "number",
      "minimum": 0,
      "description": "Monthly output token volume"
    },
    "utilization_pct": {
      "type": "number",
      "maximum": 100,
      "minimum": 1,
      "description": "Expected GPU utilization % (default 60)"
    },
    "api_cost_per_1m_out": {
      "type": "number",
      "minimum": 0,
      "description": "Current API output cost per 1M tokens"
    },
    "operational_overhead_pct": {
      "type": "number",
      "minimum": 0,
      "description": "Ops overhead % on GPU cost (default 40)"
    }
  }
}

self-host-breakeven-calculator annotations

{
  "title": "Self-Host Breakeven Calculator",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

context-window-planner — Context Window Planner

Advertised by the server during the last successful anonymous check.

Advertised read-only

Use when a user needs to know whether a document plus prompt plus output fits within a model's context window, or wants a strategy recommendation (truncate/summarize/rag/chunk).

context-window-planner input schema

{
  "type": "object",
  "examples": [
    {
      "doc_tokens": 18000,
      "model_context_window": 200000
    }
  ],
  "required": [
    "doc_tokens",
    "model_context_window"
  ],
  "properties": {
    "doc_tokens": {
      "type": "number",
      "minimum": 0,
      "description": "Primary document/content tokens"
    },
    "strategy_hint": {
      "enum": [
        "truncate",
        "summarize",
        "rag",
        "chunk"
      ],
      "type": "string",
      "description": "Preferred strategy (optional)"
    },
    "overhead_tokens": {
      "type": "number",
      "minimum": 0,
      "description": "System prompt + few-shot + history (default 2000)"
    },
    "expected_out_tokens": {
      "type": "number",
      "minimum": 0,
      "description": "Reserved output budget (default 1000)"
    },
    "model_context_window": {
      "type": "number",
      "minimum": 1,
      "description": "Target model context size"
    }
  }
}

context-window-planner annotations

{
  "title": "Context Window Planner",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

quantization-calculator — Quantization Calculator

Advertised by the server during the last successful anonymous check.

Advertised read-only

Use when a user is planning to quantize an LLM to fit on smaller hardware. Given parameter count and precision transition, returns VRAM requirement, speedup estimate, and approximate quality delta.

quantization-calculator input schema

{
  "type": "object",
  "examples": [
    {
      "params_billions": 8
    }
  ],
  "required": [
    "params_billions"
  ],
  "properties": {
    "batch_size": {
      "type": "number",
      "minimum": 1,
      "description": "Serving batch size (default 1)"
    },
    "precision_to": {
      "enum": [
        "fp32",
        "fp16",
        "bf16",
        "fp8",
        "int8",
        "int6",
        "int5",
        "int4",
        "int3",
        "int2",
        "int1"
      ],
      "type": "string",
      "description": "Target precision (default int4)"
    },
    "precision_from": {
      "enum": [
        "fp32",
        "fp16",
        "bf16",
        "fp8",
        "int8",
        "int6",
        "int5",
        "int4",
        "int3",
        "int2",
        "int1"
      ],
      "type": "string",
      "description": "Starting precision (default bf16)"
    },
    "kv_cache_tokens": {
      "type": "number",
      "minimum": 0,
      "description": "Max KV cache tokens (default 8192)"
    },
    "params_billions": {
      "type": "number",
      "minimum": 0.1,
      "description": "Model parameter count in billions"
    }
  }
}

quantization-calculator annotations

{
  "title": "Quantization Calculator",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

fine-tune-roi-calculator — Fine-Tune ROI Calculator

Advertised by the server during the last successful anonymous check.

Advertised read-only

Use when a user is considering fine-tuning vs prompt engineering. Returns training cost, monthly inference savings, months-to-ROI, and breakeven volume.

fine-tune-roi-calculator input schema

{
  "type": "object",
  "examples": [
    {
      "train_tokens": 50000000,
      "monthly_inference_tokens": 300000000
    }
  ],
  "required": [
    "train_tokens",
    "monthly_inference_tokens"
  ],
  "properties": {
    "train_tokens": {
      "type": "number",
      "minimum": 0,
      "description": "Training tokens (dataset × epochs)"
    },
    "train_cost_per_1m": {
      "type": "number",
      "minimum": 0,
      "description": "Training cost per 1M tokens"
    },
    "prompt_reduction_pct": {
      "type": "number",
      "maximum": 100,
      "minimum": 0,
      "description": "Prompt size reduction % from eliminating few-shot (default 0)"
    },
    "base_inference_cost_1m": {
      "type": "number",
      "minimum": 0,
      "description": "Baseline API output cost per 1M"
    },
    "monthly_inference_tokens": {
      "type": "number",
      "minimum": 0,
      "description": "Expected monthly inference volume (output tokens)"
    },
    "finetuned_inference_cost_1m": {
      "type": "number",
      "minimum": 0,
      "description": "Fine-tuned inference cost per 1M"
    }
  }
}

fine-tune-roi-calculator annotations

{
  "title": "Fine-Tune ROI Calculator",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

eval-cost-calculator — Evaluation Cost Calculator

Advertised by the server during the last successful anonymous check.

Advertised read-only

Use when a user needs to budget an LLM evaluation run. Given samples/models/trials, returns total cost, per-run cost, and parallel time estimate.

eval-cost-calculator input schema

{
  "type": "object",
  "examples": [
    {
      "samples": 2000
    }
  ],
  "required": [
    "samples"
  ],
  "properties": {
    "model": {
      "type": "string",
      "description": "Eval model (default claude-sonnet-4-6)"
    },
    "models": {
      "type": "number",
      "minimum": 1,
      "description": "Candidate models (default 1)"
    },
    "samples": {
      "type": "number",
      "minimum": 1,
      "description": "Number of eval samples"
    },
    "provider": {
      "type": "string",
      "description": "Eval provider (default anthropic)"
    },
    "avg_tokens_in": {
      "type": "number",
      "minimum": 0,
      "description": "Avg input tokens per sample (default 2000)"
    },
    "judge_enabled": {
      "type": "boolean",
      "description": "Enable LLM-as-judge second pass (default false)"
    },
    "avg_tokens_out": {
      "type": "number",
      "minimum": 0,
      "description": "Avg output tokens per sample (default 500)"
    },
    "judge_tokens_in": {
      "type": "number",
      "minimum": 0,
      "description": "Judge input tokens (default 1500)"
    },
    "judge_tokens_out": {
      "type": "number",
      "minimum": 0,
      "description": "Judge output tokens (default 200)"
    },
    "trials_per_sample": {
      "type": "number",
      "minimum": 1,
      "description": "Repeats per sample (default 1)"
    }
  }
}

eval-cost-calculator annotations

{
  "title": "Evaluation Cost Calculator",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

observability-cost-calculator — LLM Observability Cost Calculator

Advertised by the server during the last successful anonymous check.

Advertised read-only

Use when a user needs to budget LLM observability tooling. Returns monthly cost at given request volume with retention adjustment.

observability-cost-calculator input schema

{
  "type": "object",
  "examples": [
    {
      "provider": "langsmith",
      "requests_per_day": 50000
    }
  ],
  "required": [
    "requests_per_day",
    "provider"
  ],
  "properties": {
    "provider": {
      "enum": [
        "langsmith",
        "langfuse",
        "helicone",
        "portkey",
        "arize",
        "braintrust"
      ],
      "type": "string",
      "description": "Observability provider"
    },
    "avg_log_bytes": {
      "type": "number",
      "minimum": 0,
      "description": "Avg payload bytes per traced request (default 4096)"
    },
    "retention_days": {
      "type": "number",
      "minimum": 1,
      "description": "Retention in days (default 30)"
    },
    "requests_per_day": {
      "type": "number",
      "minimum": 0,
      "description": "Average daily LLM requests"
    }
  }
}

observability-cost-calculator annotations

{
  "title": "LLM Observability Cost Calculator",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

rag-pipeline-cost-calculator — RAG Pipeline Cost Calculator

Advertised by the server during the last successful anonymous check.

Advertised read-only

Use when a user needs end-to-end RAG cost estimation (embedding + vector store + generation). Returns monthly cost with breakdown and dominant-component identification.

rag-pipeline-cost-calculator input schema

{
  "type": "object",
  "examples": [
    {
      "corpus_tokens": 25000000,
      "queries_per_day": 5000
    }
  ],
  "required": [
    "queries_per_day",
    "corpus_tokens"
  ],
  "properties": {
    "vector_store": {
      "enum": [
        "pinecone",
        "weaviate",
        "qdrant",
        "chroma",
        "turbopuffer"
      ],
      "type": "string",
      "description": "Vector store"
    },
    "answer_tokens": {
      "type": "number",
      "minimum": 0,
      "description": "Avg answer tokens (default 400)"
    },
    "corpus_tokens": {
      "type": "number",
      "minimum": 0,
      "description": "Indexed corpus size in tokens"
    },
    "generator_model": {
      "type": "string",
      "description": "Generator model (default claude-sonnet-4-6)"
    },
    "queries_per_day": {
      "type": "number",
      "minimum": 0,
      "description": "User query volume per day"
    },
    "question_tokens": {
      "type": "number",
      "minimum": 0,
      "description": "Avg question tokens (default 100)"
    },
    "chunks_retrieved": {
      "type": "number",
      "minimum": 1,
      "description": "Chunks per query (default 5)"
    },
    "chunk_size_tokens": {
      "type": "number",
      "minimum": 64,
      "description": "Avg chunk size (default 512)"
    },
    "embedding_provider": {
      "enum": [
        "openai-3-small",
        "openai-3-large",
        "voyage-3",
        "voyage-3-lite",
        "cohere-embed-v3",
        "google-text-embed-004"
      ],
      "type": "string",
      "description": "Embedding model"
    },
    "generator_provider": {
      "type": "string",
      "description": "Generator LLM provider (default anthropic)"
    },
    "reindex_fraction_per_month": {
      "type": "number",
      "maximum": 1,
      "minimum": 0,
      "description": "Fraction of corpus re-embedded per month (default 0.1)"
    }
  }
}

rag-pipeline-cost-calculator annotations

{
  "title": "RAG Pipeline Cost Calculator",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

automation-cost-calculator — Workflow Automation Platform Cost Calculator

Advertised by the server during the last successful anonymous check.

Advertised read-only

Use for generic or non-agent recurring workflow platform billing across Zapier task billing, Make credit billing, and n8n execution billing. Use agent-workflow-cost-calculator instead when the workflow is explicitly an AI agent with app actions or MCP tool calls. Use agent-loop-cost-calculator instead when the question is about LLM inference/reasoning cost per successful agent task.

automation-cost-calculator input schema

{
  "type": "object",
  "examples": [
    {
      "workflow_runs_per_month": 120000
    }
  ],
  "required": [
    "workflow_runs_per_month"
  ],
  "properties": {
    "make_modules_per_run": {
      "type": "number",
      "minimum": 1,
      "description": "Make module actions per scenario run; defaults to billable_steps_per_run"
    },
    "billable_steps_per_run": {
      "type": "number",
      "minimum": 1,
      "description": "Billable actions/modules per run (default 5)"
    },
    "workflow_runs_per_month": {
      "type": "number",
      "minimum": 0,
      "description": "Workflow/scenario runs per month"
    }
  }
}

automation-cost-calculator annotations

{
  "title": "Workflow Automation Platform Cost Calculator",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

agent-workflow-cost-calculator — Agent Workflow Platform Cost Calculator

Advertised by the server during the last successful anonymous check.

Advertised read-only

Use for automation-platform/iPaaS cost of an AI agent workflow, including app-action fan-out and MCP tool-call accounting, explicitly excluding LLM token spend. Use automation-cost-calculator for generic non-agent workflow billing. Use agent-loop-cost-calculator for LLM inference/reasoning cost per successful multi-step agent task.

agent-workflow-cost-calculator input schema

{
  "type": "object",
  "examples": [
    {
      "agent_runs_per_month": 20000
    }
  ],
  "required": [
    "agent_runs_per_month"
  ],
  "properties": {
    "app_actions_per_run": {
      "type": "number",
      "minimum": 0,
      "description": "Downstream app actions per agent run (default 3)"
    },
    "agent_runs_per_month": {
      "type": "number",
      "minimum": 0,
      "description": "Agent workflow runs per month"
    },
    "make_modules_per_run": {
      "type": "number",
      "minimum": 1,
      "description": "Make modules per run; defaults to app actions + MCP calls"
    },
    "mcp_tool_calls_per_run": {
      "type": "number",
      "minimum": 0,
      "description": "MCP tool calls per agent run (default 1)"
    }
  }
}

agent-workflow-cost-calculator annotations

{
  "title": "Agent Workflow Platform Cost Calculator",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

agent-loop-cost-calculator — Agent LLM Loop Cost Calculator

Advertised by the server during the last successful anonymous check.

Advertised read-only

Use for LLM inference/reasoning cost per successful multi-step agent task, including failure overhead and context growth across turns. Use agent-workflow-cost-calculator for iPaaS/app-action/MCP orchestration fees. Use automation-cost-calculator for generic Zapier/Make/n8n workflow billing.

agent-loop-cost-calculator input schema

{
  "type": "object",
  "examples": [
    {
      "tasks_per_month": 60000
    }
  ],
  "required": [
    "tasks_per_month"
  ],
  "properties": {
    "model": {
      "type": "string",
      "description": "LLM model (default claude-sonnet-4-6)"
    },
    "provider": {
      "type": "string",
      "description": "LLM provider (default anthropic)"
    },
    "success_rate": {
      "type": "number",
      "maximum": 1,
      "minimum": 0.01,
      "description": "Task success rate 0-1 (default 0.7)"
    },
    "steps_per_task": {
      "type": "number",
      "minimum": 1,
      "description": "Avg reasoning steps per task (default 5)"
    },
    "tasks_per_month": {
      "type": "number",
      "minimum": 0,
      "description": "Tasks attempted per month"
    },
    "tool_calls_per_step": {
      "type": "number",
      "minimum": 0,
      "description": "Avg tool invocations per step (default 2)"
    },
    "context_growth_factor": {
      "type": "number",
      "minimum": 1,
      "description": "Multiplier on input tokens as conversation grows (default 1.4)"
    },
    "avg_tokens_in_per_turn": {
      "type": "number",
      "minimum": 0,
      "description": "Avg input tokens per turn (default 3000)"
    },
    "avg_tokens_out_per_turn": {
      "type": "number",
      "minimum": 0,
      "description": "Avg output tokens per turn (default 400)"
    }
  }
}

agent-loop-cost-calculator annotations

{
  "title": "Agent LLM Loop Cost Calculator",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (1 of 1 answered).

2026-11-07: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks: 1 of 1 (100%)
Average latency: 2665 ms
95th percentile latency: 2665 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 6, 2026, 10:08 PM UTC · probe · passed · 2665 ms · metadata changed · 12 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http model-ruler-mcp https://modelruler.dev/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add model-ruler-mcp --url https://modelruler.dev/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable model-ruler-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "model-ruler-mcp": {
      "url": "https://modelruler.dev/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "model-ruler-mcp": {
      "type": "streamableHttp",
      "url": "https://modelruler.dev/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start model-ruler-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "model-ruler-mcp": {
      "type": "http",
      "url": "https://modelruler.dev/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http model-ruler-mcp https://modelruler.dev/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.

Claude Desktop configuration

https://modelruler.dev/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "model-ruler-mcp": {
      "serverUrl": "https://modelruler.dev/mcp"
    }
  }
}

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Model Ruler MCP

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