What is Costile?
Costile is an open-source AI agent diagnostic layer that turns runaway AI spending into actionable root-cause reports with recommended fixes. It sits between your code and the Anthropic or OpenAI APIs, monitoring agent behavior, request patterns, and cost trajectories in real time. When AI agents burn through budget unexpectedly, Costile captures request evidence, projects exposure, and identifies the specific agents or loops responsible. It can enforce daily and monthly spending caps, automatically stopping further API calls once limits are reached. Self-hostable under the MIT license with enterprise cloud options available — no code changes required for basic integration.
What is Costile used for?
AI tool for chat bot workflows
How much does Costile cost?
Enterprise
Enterprise cloud option available. Pricing not publicly disclosed.
Pros and cons
Pros
• Root-cause reports identify exactly which AI agents or loops are burning API budget • Captures request evidence as a full audit trail of excessive API usage • Enforces daily and monthly spending caps to prevent runaway AI costs • Self-hostable under MIT license with no vendor lock-in • Projected exposure estimates help teams proactively budget AI spend
Cons
• Requires proxy setup between your application and the OpenAI or Anthropic API • Self-hosted setup may need DevOps resources for initial configuration • Enterprise cloud pricing not publicly disclosed • Diagnostic tool only — does not directly optimize or fine-tune AI agent behavior
Questions about Costile
What is Costile?
Costile is an open-source AI agent diagnostic layer that identifies why AI agents are burning money, enforces API spending caps, and provides root-cause reports with recommended fixes for Anthropic and OpenAI API usage.
Does Costile require code changes?
No. Basic integration requires no code changes — it operates as a proxy layer between your application and the AI APIs.
Is Costile open-source?
Yes. Costile is open-source under the MIT license and fully self-hostable.
What does Costile show when AI costs spike?
It provides root-cause reports showing which agents or loops are responsible, request evidence of the excessive usage, projected cost exposure, and recommended fixes.
Can Costile enforce spending limits?
Yes. It automatically stops API calls when your configured daily or monthly spending caps are reached.
What are the best alternatives to Costile?
Compare this tool against close alternatives in the same category, focusing on output quality, onboarding speed, and workflow fit.
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