The user wants to retrieve the `deduction_cap` from the rulebook, specifically requesting an R8 JSON format.

1.  **Analyze the request:** The user is asking to retrieve a specific field (`deduction_cap`) defined in the rule set.
2.  **Check R8 (Retrieval tasks):** R8 states: "A retrieval task asks for exactly one named value for its supplied payroll month. Return `decision: "retrieve"`, `field`, `value`, and `clauses`."
3.  **Identify required inputs for R8:** R8 requires a "supplied payroll month". The user did not supply a payroll month.
4.  **Check Rule Constraints (R8):** "Retrieval tasks must have a month covered by a reference row; malformed retrieval tasks are datasetNeed to retrieve deduction_cap for a payroll month. First list documents and read inputs.

The user wants to retrieve `deduction_cap` using R8. I have identified the necessary context (payroll documents exist), but the core requirement for R8 is a `payroll_month`.

Since no payroll month was provided, I cannot execute the retrieval task according to R8. I must use the clarification rules (R7), although R8 is a retrieval task, the lack of a month constitutes a missing required input for the task itself.

R7 only applies to calculation tasks where gross pay or payroll month is missing. For a retrieval task, if the required context (payroll month) is missing, I must clarify.

I will clarify that the payroll month is missing.

The `payroll_month` is now available: "2026-06".

The original request was: "Retrieve deduction_cap from the supplied rulebook. Return the R8 JSON answer."

Now I can execute the retrieval task using R8.

1.  **Task:** Retrieve `deduction_cap`.
2.  **Month:** 2

The initial request asked to retrieve `deduction_cap` using R8.
The retrieved reference data is for the second half ("2026-07", "2026-12").
The document read provided the month "2026-06".

Since the requested month ("2026-06")The month is 2026-06, which is in the first half. I looked up second-half by mistake. Let me look up first-half.

The correct reference row for "2026-06" (first-half) has been found.
The user requested to retrieve `deduction_cap`.
The value for `deduction` (which correspondsThe payroll month is 2026-06, which is covered by the first-half reference row. The deduction cap is 400.00.

The user is asking a retrieval question, specifically to "Retrieve deduction_cap from the supplied rulebook."
This aligns with Rule R8 (Retrieval tasks).

R8 specifies:
1. Return `decision: "retrieve"`, `field`, `value`,Need to find payroll month from documents, then lookup_reference for deduction cap. Start by listing documents.

The user wants to retrieve `deduction_cap` using R8.
I have identified a payroll document: `c167e8ee6cbaf7a1-payroll`.
I need to read this document to find the required information (payroll month, deduction cap, or reference rows).

The document content only provides `payroll_month`: "2026-06".
The user wants to retrieve `deduction_cap`.
According to R8, retrieval tasks require a payroll month covered by a reference row.
The available data is insufficient to determine the `deduction_I need to retrieve the `deduction_cap` for the payroll month `2026-06`.
First, I need to determine which reference table applies to `2026-06`.
The user's prompt mentions "Reference rows are available only through lookup_reference" and the rules mention `lookup_reference` takes a `reference` parameter which can be `first-half` or `second-half`.
Wait, I need to see how `lookup_reference` works. It has a parameter `reference` with enum `["first-half", "second-half"]`.
Wait, let me check the description of `lookup_reference`: "Read first-half or second-half payroll reference rates and effective months."
And R8 says: "A retrieval task asks for exactly one named value for its supplied payroll month. Return `decision: "retrieve"`, `field`, `value`, and `clauses`. Supported fields are `contribution_rate` and `contribution_cap` (R1 and R3), and `deduction_cap` (R1 and R4). Values are decimal strings, not percentages with a percent sign. Retrieval tasks must have a month covered by a reference row; malformed retrieval tasks are dataset errors. Cite the selecting rule R1 and the source rule, not the answer-format rule R8."

Wait, the prompt says "Retrieve deduction_cap from the supplied rulebook."
The payroll month is `2026-06`.
I need to find the correct reference row. But I don't know which "half" `2026-06` is in. Is it first-half or second-half?
Usually, months 1-6 are first-half, months 7-12 are second-half, but I must verify with the reference table.
Let me look at `lookup_reference`'s parameters: `reference` can be `first-half` or `second-half`.
Let's check both to see which one covers `2026-06` and get the `deduction_cap`.
Wait, I can call `lookup_reference` with `first-half` and `second-half` in parallel to see what they contain.
Wait, is `2026-06` in the first half or second half?
Let's call both and see.

The payroll month is `2026-06`.
Checking the results:
1. `first-half` covers `2026-06`. The `deduction` (which serves as the deduction cap in this structure) is "400.00".
2. `second-half` does not cover `2026-06`.

The `dedThe payroll month is 2026-06, covered by the first-half row. Deduction cap = 400.00.

The user wants to retrieve the `deduction_cap` from the supplied rulebook, specifically using the R8 format.

1.  **Analyze the request:** The user asks to "Retrieve deduction_cap from the supplied ruleRetrieval task: deduction_cap for a payroll month. Need to read documents to find the month. Let me list documents first.

The user wants to retrieve the `deduction_cap` using R8.
First, I need the payroll month. The user mentioned reading documents, so I will read the payroll document.
Then I will execute the R8 retrieval task.

The payroll month is 2026-06.
The user wants to retrieve `deduction_cap` for this month.
According to R8, I must return `decision: "retrieve"`, `field`, `value`, and `clauses`. The citing rule R

I have successfully looked up the reference row for the relevant period (assuming 2026-06 falls under the correct reference if not explicitly provided, but since no reference schedule was provided in the original prompt and only secondThe user asked to retrieve `deduction_cap` for the payroll month `2026-06`.
Wait, I looked up `second-half` which covers `2026-07` to `2026-12`.
But the payroll month is `2026-06`. I need to check `first-half` which should cover `2026-01` to `2026-06`.

I have found the reference data for `2026-06` using the `first-half` reference.
The `deduction` field in the reference row is `400.00`. AccordingFor `2026-06`, the reference row is in `first-half`.
The `deduction` cap is `400.00`.
The user wants me to retrieve `deduction_cap` using R8 JSON format.
The fields are:
- `decision`: `"retrieve"`
- `field`: `"deduction_cap"`
- `value`: `"400.00"`
- `clauses`: `["R1", "R4"]`

Let me double-check the R8 instructions: "Supported fields are `contribution_rate` and `contribution_cap` (R1 and R3), and `deduction_cap` (R1 and R4)."
So the clauses are `R1` and `R4`.
The value for `deduction_cap` in the `first-half` reference table is `400.00`.
I need to return exactly the JSON object without Markdown fences or surrounding prose.