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Berry
by leochlon
Workflow verification server with hallucination detection and evidence-backed trace auditing.
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Works in:CursorCodexGemini CLI
Exposes:ToolsResources
What it does
Berry is an MCP server designed for workflow verification, allowing AI agents to detect hallucinations and audit execution traces. It transforms uncited LLM outputs into evidence-backed results by providing a system to track spans and verify claims.
Tools
detect_hallucination: Analyzes model output to identify potential hallucinations using token logprobs.audit_trace_budget: Monitors and audits the trace budget for verification tasks.start_run: Initiates a new evidence notebook run.load_run: Loads an existing run for analysis.add_span: Adds a new span of evidence to the current run.list_spans: Lists all spans associated with a run.search_spans: Searches through existing evidence spans.
Installation
Add the following to your claude_desktop_config.json:
{
"mcpServers": {
"berry": {
"command": "berry",
"args": []
}
}
}
Note: Requires running pipx install -e . and berry init in your repository first.
Supported hosts
Cursor, Codex, Claude Code, Gemini CLI
Quick install
pipx install -e . && berry initInformation
- Pricing
- free
- Published
- 5/13/2026
- stars
