Many agent failures start in the tool definitions themselves. Apex Agent Studio lets you design, lint, simulate and export Claude tool-use agents, so you catch those problems before your users do.
3 errors · 5 warnings · 41/100
getDataTool names must be unique — the API rejects the request.search_orders and lookup_order overlap (62%)Similar descriptions make it hard for Claude to choose.issue_refund.amount: no descriptionClaude has to guess the format and currency.Claude chooses tools and fills in arguments from your names, descriptions and schemas. When those are vague, the failures look like model mistakes and are hard to debug.
Overlapping or one-line descriptions leave the model guessing which tool fits the request.
Undocumented parameters, missing formats and loose types produce inputs your backend rejects.
Timeouts, outages and invalid calls only show up in production, after the agent has already shipped.
Apex Agent Studio covers the whole loop of building a Claude tool-use agent, from the first schema to an SDK-ready agent loop.
Define tools and parameters visually and watch the Anthropic input_schema update live. Import existing tools in Anthropic, MCP or OpenAI format.
A 0–100 score per tool. Flags API-invalid schemas, thin descriptions, undocumented parameters and overlapping tools, with one-click fixes.
Step through reasoning, tool calls, schema validation, retries, latency and tokens. Use the free simulator, or run live against Claude with your own key.
One click exports Python or TypeScript agent loops for the official Anthropic SDK, plus cURL and request JSON.
No install and no account. Open the Studio and start with your own tools or a template.
Paste existing definitions or start from a template. Apex reads Anthropic input_schema, MCP inputSchema and OpenAI function formats.
Work through the score: name tools clearly, explain when to use each one, and document every parameter.
Replay real requests, inject a malformed call to test recovery, then export the agent loop to your codebase.
api.anthropic.com, directly from your browser.Apex Labs was founded by Emin Qurbanov to make AI agents dependable in production. We start where we believe many agent failures begin: the interface between the model and the tools it calls.
Apex Agent Studio is our first product. It is built for Claude and its tool-use API, and it exports code for the official Anthropic SDK.
We are looking for early design partners: teams shipping agents on Claude who want better tool definitions and fewer production surprises. Get in touch →
Try the Studio for free, or write to us about becoming a design partner.