mattthomas7641

Personal Finance Agent — Data skill for Claude Code

Data community

Northstar (Personal Finance Agent): answers questions about your own bank data with numbers verified before you see them, plans retirement across 401(k) and Roth IRA with FI and Coast FIRE projections.

How to install Personal Finance Agent

This entry records only its repository, not the path inside it, so there is no exact command to give. Open mattthomas7641/personal-finance-agent and copy the folder into ~/.claude/skills/, or the file into ~/.claude/agents/.

What Personal Finance Agent does

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README

Northstar (Personal Finance Agent)

A personal finance agent you can actually trust with numbers, built to keep you pointed at your goals. Connect your banks (Plaid) or import CSVs, then ask questions in plain English — *"Why was my spending higher last month?"*, *"What am I paying for subscriptions per year?"* — and get answers where **every number is verified against your data before you see it**.

LLMs are bad at arithmetic and happy to make up figures. This agent can't: it answers by running read-only SQL and a calculator, and a deterministic **number checker** rejects any answer containing a figure that didn't come from a tool result. Rejected answers go back to the agent to fix.

 Plaid (sandbox/prod) ─┐                       ┌──────────── agent loop (Claude) ────────────┐
 CSV exports ──────────┼─► transactions ──────►│ get_schema · run_sql (read-only sandbox)     │
 demo ledger ──────────┘      │                │ calculate (safe AST) · get_insights · chart  │
                              ▼                │ final_answer ──► NUMBER CHECKER ──► user     │
              categorization cascade           │                    │ unsupported numbers?    │
   your rules → built-ins → memory → Plaid → LLM│                    └──► rejected, retry      │
                              │                └──────────────────────────────────────────────┘
                              ▼
     deterministic insights: subscriptions & price hikes · duplicates · unusual charges · budgets

What makes it trustworthy


Number checker	Every figure in an answer must match (at its stated precision, incl. `$1.2k`, `%`) a SQL or calculator result from that run. Dates and years aren't treated as claims. Unverifiable answers are rejected and retried, and labeled if they still fail.
SQL sandbox	The agent's connection is opened read-only, and a SQLite authorizer only allows reading the `transactions` view: no writes, no `ATTACH`/`PRAGMA`, and no ac