Finance: Expense Audit Review with Claude Code: MCP Tool Boundary
A production playbook for expense audit review in finance operations using Claude Code: mcp tool boundary, run-scoped inputs, logs, typed results, and artifacts.
Audience: Finance teams auditing employee expenses
The problem
Finance teams auditing employee expenses need expense audit review to run repeatedly against receipts, policy docs, card transactions, and reimbursement requests. In finance operations, the pain is not one good answer; it is repeatability, auditability, exception handling, and evidence that survives handoff.
Implementation path
Expose only the MCP tools needed for expense audit review, validate tool arguments, keep credentials in the owning service, and log each call outside the sandbox.
Tradeoffs and failure modes
Narrow tool boundaries reduce agent flexibility, but make the integration reviewable and supportable. For expense audit review, the practical test is whether a second run can be debugged, retried, and consumed by a product without reading the raw agent transcript.
Tool policy
tool: finance-expense-audit_lookup
agent: Claude Code
input_scope: /skill/.argo/inputs
credential_owner: broker
log_arguments: true
network_policy: allowlisted
Run this on Argo