CyberRouter · Free resources
Plan your context.
Understand your tool budget.
Practical tools and worked examples for developers using LLM gateways, retrieved context, and MCP. Open a tool and start with the included example. No account or API key required.
Free tools
Context Budget Calculator
Budget instructions, history, tools, retrieved passages, and output. See remaining tokens or the exact shortfall, then share your budget.
Open calculator →MCP Tool Schema Token Calculator
Paste tool definitions and inspect their serialized token counts. See the largest definitions and their share of a context window.
Open calculator →Worked context planning guides
RAG Context Budget: Calculate How Many Chunks Fit
Work out how much room is left for retrieved passages, including the overhead around each chunk.
Read the worked example →MCP Tool Token Budget: Count Schemas and Results
Account for the tool definitions and results your host actually sends to the model.
Read the worked example →Use your models with CyberRouter
CyberRouter connects your provider keys through one API and adds security reference context to supported model requests. The calculators help plan space; they do not measure response quality or make model requests.