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Use when the agent encounters money-shaped identifiers (amount, price, balance, total, cost), performs arithmetic across monetary fields, or writes/reads money to a database. Enforces Decimal-only math.
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Basierend auf der SOC-Berufsklassifikation
Use after PR-sized work completes (or on /mek-drift) to compare auto scores against .mek/drift-baseline.json and surface divergences > 0.15.
Use when the agent is about to perform a risky operation (destructive shell, deploy, schema migration, money write, force-push). Reminds to record HITL approval and points at compliance/ templates.
STUB. Future v0.2.0 feature — a mini-SQLite ledger so the agent can record/query journal entries for any context (token spend, invoicing, etc.). Not active in v0.1.0.
Use when starting any conversation in a project where MEK is installed - announces the three guardrails (compliance, drift, ledger) and how to invoke them.
| name | ledger |
| description | Use when the agent encounters money-shaped identifiers (amount, price, balance, total, cost), performs arithmetic across monetary fields, or writes/reads money to a database. Enforces Decimal-only math. |
If you see any of:
amount_*, price_*, balance_*, total_*, cost_*, fee_*, tax_*…use the helpers in lib/decimal_math.py. Never use Python float for money.
from lib.decimal_math import to_decimal, to_db_amount, sum_money, pct_of, rebalance, MONEY_PLACES, ZERO
to_decimal(value) — coerce int/str/Decimal/None to Decimal. Float goes through str().to_db_amount(value) — quantize to 4 places, return TEXT for SQLite/Postgres.sum_money(iterable) — sum Decimals exactly. Rejects float with TypeError.pct_of(total, percent) — return percent% of total, quantized.rebalance(total, weights) — split total across weights; last bucket absorbs rounding so the sum is exact.total = 0.1 + 0.2 # FLOAT — gives 0.30000000000000004
amount = price * 0.08 # FLOAT TAX — silent rounding error
record["amount"] = 33.33 # WRITES FLOAT TO DB
…rewrite as:
total = sum_money([Decimal("0.10"), Decimal("0.20")]) # exact 0.30
amount = pct_of(price, Decimal("8")) # exact 8% of price
record["amount"] = to_db_amount(Decimal("33.33")) # "33.3300"
hooks/scripts/money_math_guard.py runs on PreToolUse for Edit/Write. It scans the diff for float literals next to money-shaped identifiers and emits a WARN-level reminder. Never blocks unless mek.toml > [compliance.gates] > money_write = "block".