Let me start by listing the documents to see what's in this case.

There are three documents: payroll, contract, and amendment. Let me read all three since they're independent.

Payroll record:
- gross_pay: 2300.95
- payroll_month: 2026-02
- allowed_deduction: 272.78

Contract: gross_pay 1800.95 (differs from payroll's 2300.95)
Amendment: gross_pay 2300.95, approved: true, effective_month: 2026-03

Per R9: An amendment resolves a contract conflict only if it is approved, its effective month is no later than the payroll month, and its amount equals the payroll record's gross pay. Here the amendment is approved and equals the payroll gross pay (2300.95), but its effective month is 2026-03 which is AFTER the payroll month 2026-02. So it does not resolve the conflict.

Per R7 step 4: If optional contract_gross_pay is present and differs from gross_pay, neither source takes precedence unless an approved amendment resolves it under R9. Otherwise return decision: "clarify" and reason_code: "CONFLICTING_GROSS_PAY", citing R7 and R9.

So this is a clarify case: the amendment is future-dated (2026-03 > 2026-02), so it doesn't resolve the conflict between contract gross pay 1800.95 and payroll gross pay 2300.95.

Wait — but do I even need to check the reference row? Per R7, the checks are in order:
1. Missing gross_pay — no, it's present.
2. Missing payroll_month — no, present.
3. Month without a reference row — 2026-02 is covered (only 2026 is covered; let me verify with lookup_reference).
4. Conflicting gross_pay — contract differs from payroll; amendment doesn't resolve (future effective month).

The order matters: check 3 comes before check 4. 2026-02 should have a reference row, so we proceed to check 4, which fails → clarify with CONFLICTING_GROSS_PAY.

Actually, should I verify the reference row exists for 2026-02? The rule says "Only 2026 is covered" and the month is 2026-02, so it's covered. But to be careful, I could look up the reference. However, since the answer is a clarification due to the conflicting gross pay, and the check order is 1→2→3→4, I should confirm check 3 passes (month has a reference row) before concluding check 4 applies. Let me look up the reference to confirm 2026-02 has a row. Actually, the lookup_reference tool takes "first-half" or "second-half" — presumably February is in the first half of the year. Let me check.

Actually, since the answer is clarify, I don't strictly need the reference values, but I should verify the month is covered to ensure the conflict check is the right blocker (per the ordered checks). Let me do the lookup for first-half to confirm 2026-02 is covered.

The clarification JSON format: decision: "clarify", reason_code: "CONFLICTING_GROSS_PAY", clauses citing R7 and R9. Include a short explanation naming the unresolved blocker and asking for its resolution. No monetary fields.

Let me verify the reference row exists for 2026-02 first.

Hmm, the first-half reference covers months 2026-01 through 2026-06 (the "months" field shows ["2026-01", "2026-06"] which I interpret as a range from 2026-01 to 2026-06). So 2026-02 is covered. Check 3 passes.

Now check 4: contract_gross_pay = 1800.95, payroll gross_pay = 2300.95 — they differ. Amendment: approved = true, amount 2300.95 equals payroll gross pay, but effective_month 2026-03 is later than payroll month 2026-02. Per R9, the amendment must have effective month no later than the payroll month to resolve the conflict. This amendment is future-dated relative to the payroll month, so it does not resolve the conflict.

Therefore: decision "clarify", reason_code "CONFLICTING_GROSS_PAY", clauses R7 and R9.

The clarification answer format: decision, reason_code, clauses, plus optional explanation. No monetary fields. Include a short explanation naming the unresolved blocker and asking for its resolution.

Let me start by listing the documents to get the case inputs.

Let me analyze:

- Payroll record: gross_pay = 2300.95, payroll_month = 2026-02, allowed_deduction = 272.78
- Contract: gross_pay = 1800.95
- Amendment: gross_pay = 2300.95, approved = true, effective_month = 2026-03

R7 step 4: contract_gross_pay (1800.95) differs from gross_pay (2300.95). Check R9: amendment resolves conflict only if approved (yes), effective_month ≤ payroll_month (2026-03 > 2026-02, so NO), and amount equals payroll record's gross pay (yes). Since effective month is after payroll month, it's a future amendment — does not resolve the conflict.

So decision: clarify, reason_code: CONFLICTING_GROSS_PAY, citing R7 and R9.

Wait — but should I check the reference row first? R7 order: 1. missing gross_pay — no. 2. missing payroll_month — no. 3. month without reference row — 2026-02 is in 2026, covered. But do I need to check lookup_reference? The month is 2026-02, which is covered by 2026 rows. The conflict check at step 4 applies: contract gross pay differs from payroll gross pay, and the amendment doesn't resolve it (future effective month). So clarify with CONFLICTING_GROSS_PAY.

Actually, let me double check the amendment: effective_month 2026-03, payroll month 2026-02. 2026-03 > 2026-02, so it's a future amendment. Per R9: "A draft, future, or different-amount amendment does not resolve a conflict." So it does not resolve.

Therefore: decision "clarify", reason_code "CONFLICTING_GROSS_PAY", clauses ["R7", "R9"], with a short explanation naming the unresolved blocker and asking for resolution.

The instructions say: "For clarification include a short explanation naming the unresolved blocker and asking for its resolution."

Also "Do not include input-only fields such as payroll_month, contract_gross_pay, or amendment."

So the JSON:

{
  "decision": "clarify",
  "reason_code": "CONFLICTING_GROSS_PAY",
  "clauses": ["R7", "R9"],
  "explanation": "..."
}

No need for calculate or lookup_reference since we're not calculating. The conflict check happens before calculation. The order in R7: check required and conflicting inputs in this order — steps 1-4. Step 3 (month without reference row) — 2026-02 has a reference row (2026 is covered), so no issue. Step 4 triggers.

I don't strictly need lookup_reference since the month is within 2026 which is covered. The clarification is due to the conflict, not the reference. I could verify the reference exists but the rules say "Only 2026 is covered" and 2026-02 is in 2026, so a row exists. No calculation needed.

Return one JSON object without Markdown fences or surrounding prose.

Let me start by listing the documents to see what's in this case.

There's a payroll record, a contract, and an amendment. Let me read all three documents. They're independent reads, so I can do them in parallel.

Let me analyze:

- Payroll record: gross_pay = 2300.95, payroll_month = 2026-02, allowed_deduction = 272.78
- Contract: gross_pay = 1800.95
- Amendment: gross_pay = 2300.95, approved = true, effective_month = 2026-03

Payroll month is 2026-02. The amendment's effective month is 2026-03, which is later than the payroll month 2026-02. Under R9, an amendment resolves a conflict only if it is approved, its effective month is no later than the payroll month, AND its amount equals the payroll record's gross pay. Here the effective month (2026-03) is AFTER the payroll month (2026-02), so the amendment does NOT resolve the conflict.

So we have a conflict: contract_gross_pay = 1800.95 vs gross_pay = 2300.95. The amendment is approved but future-effective (2026-03 > 2026-02), so it doesn't resolve the conflict.

Wait — but is there a conflict? The payroll record has gross_pay = 2300.95, and the contract has gross_pay = 1800.95. These differ. R7 item 4: "If optional `contract_gross_pay` is present and differs from `gross_pay`, neither source takes precedence unless an approved amendment resolves it under R9. Otherwise return `decision: "clarify"` and `reason_code: "CONFLICTING_GROSS_PAY"`, citing R7 and R9."

The amendment is approved but its effective month is 2026-03, which is later than the payroll month 2026-02. So it doesn't resolve the conflict. Therefore, decision: clarify, reason_code: CONFLICTING_GROSS_PAY, citing R7 and R9.

Hold on — let me double-check. The amendment amount (2300.95) equals the payroll record's gross pay (2300.95). It's approved. But effective_month 2026-03 > payroll month 2026-02. R9: "It resolves a contract conflict only if it is approved, its effective month is no later than the payroll month, and its amount equals the payroll record's gross pay. ... A draft, future, or different-amount amendment does not resolve a conflict."

This is a future amendment relative to the payroll month. So it does not resolve the conflict. Clarify with CONFLICTING_GROSS_PAY.

Hmm, but wait — should I even consider whether the reference row exists? 2026-02 is covered by the rules (only 2026 is covered). But since the conflict blocks calculation, I return clarify before calculating. The clarification check order in R7: 1. missing gross_pay — no. 2. missing payroll_month — no. 3. month without reference row — 2026-02 should have a row (only 2026 covered). 4. contract conflict — yes, contract 1800.95 ≠ payroll 2300.95, and amendment doesn't resolve because it's future-effective.

So the answer is clarify with CONFLICTING_GROSS_PAY, citing R7 and R9.

The output format: "clarify uses decision, reason_code, clauses" plus optional explanation string. No monetary fields.

Citations: "Unresolved contract conflicts cite R7 and R9." So clauses: ["R7", "R9"].

Explanation: name the unresolved blocker — the contract gross pay (1800.95) differs from the payroll record gross pay (2300.95), and the amendment, though approved and matching in amount, is effective 2026-03, after the payroll month 2026-02, so it cannot resolve the conflict under R9. Ask for resolution (e.g., an approved amendment effective no later than 2026-02).

I don't need lookup_reference or calculate since we're not calculating. The clarify decision comes before any calculation.

Let me format the JSON:

{
  "decision": "clarify",
  "reason_code": "CONFLICTING_GROSS_PAY",
  "clauses": ["R7", "R9"],
  "explanation": "..."
}

No Markdown fences, one JSON object, no surrounding prose. Wait — the instruction says "Return one JSON object without Markdown fences or surrounding prose." So my entire response should just be the JSON object. But I've already made tool calls with some text. The final response should be just the JSON.