[ { "api_error_status": null, "duration_api_ms": 36934, "duration_ms": 36987, "fast_mode_disabled_reason": "sdk_opt_in_required", "fast_mode_state": "off", "first_content_frame_ms": 1834, "is_error": false, "modelUsage": { "claude-opus-5": { "cacheCreationInputTokens": 4669, "cacheReadInputTokens": 0, "canonicalModel": "claude-opus-5", "contextWindow": 1000000, "costBasis": "list", "costUSD": 0.11755000000000002, "inputTokens": 2, "maxOutputTokens": 64000, "outputTokens": 2834, "provider": "firstParty", "thinkingTokens": 354, "webSearchRequests": 0 } }, "num_turns": 1, "permission_denials": [], "queued_turn_count": 0, "result": "## Preconditions\n\n1. Every emitted program is a single top-level `dataflow.graph` operation named `@sb_strand` with `private` visibility and no enclosing module wrapper.\n2. The graph's signature declares exactly seven block arguments in this order and with these types: `%start: none`, `%idx: index`, `%val: i32`, `%exp: i32`, `%des: i32`, `%a: memref<16xi32>`, `%b: memref<16xi32>`.\n3. The graph's result type list is empty (`-> ()`).\n4. The graph carries exactly two attributes, `input_segments = array` and `result_segments = array`, written in that order.\n5. The graph body consists of a single entry block with no explicit block label, no successors, no nested regions, and no control flow.\n6. The block body is a straight-line sequence of memory-actor and fence operations followed by exactly one terminator.\n7. The terminator is always `dataflow.graph.return %start : none`, i.e. the block returns the incoming `none` token and no other value.\n8. Every actor operation consumes the block argument `%start` as its incoming ordering/dependency token; no operation consumes a token produced by a preceding operation, so the strand is token-fan-out from `%start` rather than a token chain.\n9. Every actor operation produces an outgoing token result named `%d` where `` is that operation's zero-based position in the sequence.\n10. Every value-producing actor (loads and the read-modify-write) additionally produces a data result named `%r` placed before the token result, so those operations have the two-result form `%r, %d = ...`.\n11. Store operations, plain fences, and all fence variants produce only the token result `%d` and no data result.\n12. Every actor operation carries an `sb_index = : i64` attribute whose integer equals the operation's zero-based sequence position, so `sb_index` values are consecutive from `0` and are unique within the graph.\n13. Every memory-touching operation addresses exactly one of the two graph memref arguments, `%a` or `%b`, and always uses the single-index subscript `[%idx]` with the block argument `%idx`.\n14. Every memory-touching operation is annotated with the trailing type `: memref<16xi32>`, matching the declared memref argument type; fences carry no trailing type.\n15. Loads take the form `dataflow.load [%idx] %start`; stores take the form `dataflow.store [%idx] %val %start` and always store the block argument `%val`; the read-modify-write takes the form `dataflow.atomic_rmw [%idx] %val %start`.\n16. Fences take the form `dataflow.fence %start` and carry a `contract = #dataflow.fence_contract>`.\n17. Ordering semantics on memory accesses are expressed through a `contract` attribute of one of three attribute kinds \u2014 `#dataflow.atomic_access<...>`, `#dataflow.plain_access<...>`, or `#dataflow.rmw_contract<...>` \u2014 or are absent entirely for non-annotated plain accesses.\n18. Every `atomic_access` contract specifies `sync_scope = ` and `source_alignment_bytes = 4`; every `rmw_contract` wraps a nested `access = <...>` with the same `sync_scope = ` and `source_alignment_bytes = 4`.\n19. No SSA name is defined twice: `%r` and `%d` names are index-qualified, and the block arguments are never redefined.\n20. Results `%r` and `%d` are never used by any later operation or by the terminator, so every emitted program is well-formed with entirely dead actor results.\n21. The graph body is never empty: at least two actor operations always precede the terminator.\n\n## Sampling conventions\n\n1. The number of actor operations in the strand is drawn uniformly from the closed range 2 to 6.\n2. The actor list is built by right recursion with a counter starting at `0` and terminating exactly when the counter equals the drawn count, so indices run `0 \u2026 COUNT-1` with no gaps.\n3. The memref operand is re-chosen independently before each actor from the two-element set `{'%a', '%b'}`, so consecutive actors may or may not alias the same buffer; the initial default `'%a'` is always overwritten before use and never observable.\n4. Fence operations are still emitted with a freshly chosen memref selection in effect, but that selection is discarded because fences print no memref operand.\n5. Each actor is chosen independently and uniformly from exactly eleven fixed shapes: acquire atomic load, release atomic store, volatile plain load, volatile plain store, unannotated plain load, unannotated plain store, `seq_cst` fence, `acquire` fence, `release` fence, `seq_cst` volatile atomic store, and `add` atomic RMW.\n6. Atomic loads are always emitted with `ordering = acquire` and never with `monotonic`, `seq_cst`, or `relaxed`.\n7. Atomic stores are always emitted with `ordering = release`, except for the separate combined shape which is always `ordering = seq_cst` together with `is_volatile = true`.\n8. There is no acquire/release/`seq_cst` atomic *load* variant carrying `is_volatile = true`, and no volatile atomic load shape at all.\n9. The only atomic RMW kind emitted is `kind = add`, and its access ordering is always `monotonic`; no `sub`, `and`, `or`, `xor`, `max`, `min`, or exchange kinds appear.\n10. Fence orderings are restricted to `seq_cst`, `acquire`, and `release`; no `acq_rel` or `monotonic` fence is emitted.\n11. `sync_scope` is fixed to `` everywhere; no agent, workgroup, or thread-level scopes are sampled.\n12. `source_alignment_bytes` is fixed to `4` everywhere it appears; no under- or over-aligned accesses are generated.\n13. Plain (`#dataflow.plain_access`) contracts are only ever emitted with `is_volatile = true`; a plain access with `is_volatile = false` is instead spelled as the fully attribute-free plain load/store shape.\n14. The graph name is the fixed literal `@sb_strand` and its visibility is fixed to `private`; no alternative names or public graphs are produced.\n15. Value names follow a fixed scheme: data results are `%r` plus the decimal sequence index, token results are `%d` plus the same index, with no other naming variation.\n16. The prologue and epilogue are constant literal text, including fixed indentation of four spaces for the signature continuation lines and two spaces for every body operation and the terminator.\n17. The memref type is fixed at `memref<16xi32>` for both buffers; no other element types, ranks, shapes, or memory spaces are sampled.\n18. The block arguments `%exp` and `%des` are declared in every program but never referenced by any emitted actor, since no compare-exchange shape is part of the actor alternatives.\n19. The `input_segments`/`result_segments` attribute values are hard-coded constants and are not derived from or varied with the sampled body.\n20. Only one memory strand is generated per program; the grammar never emits multiple graphs, multiple blocks, or parallel strands.", "result_index": 0, "session_id": "49ffa0d2-106e-4485-922d-314b6954c19a", "stop_reason": "end_turn", "subagent_stats": { "by_type": {}, "completed": 0, "failed": 0, "killed": { "parent": 0, "system": 0, "user": 0 }, "max_depth": 0, "refused": { "budget": 0, "concurrency_limit": 0, "depth_limit": 0 }, "requested": { "background": 0, "foreground": 0, "unset": 0 }, "spawned": 0, "spawned_by_subagents": 0, "started_in_background": 0 }, "subtype": "success", "terminal_reason": "completed", "time_to_request_ms": 53, "total_cost_usd": 0.11755000000000002, "ttft_ms": 6212, "ttft_stream_ms": 1141, "type": "result", "usage": { "cache_creation": { "ephemeral_1h_input_tokens": 4669, "ephemeral_5m_input_tokens": 0 }, "cache_creation_input_tokens": 4669, "cache_read_input_tokens": 0, "inference_geo": "not_available", "input_tokens": 2, "iterations": [], "output_tokens": 2834, "output_tokens_details": { "thinking_tokens": 354 }, "server_tool_use": { "web_fetch_requests": 0, "web_search_requests": 0 }, "service_tier": "standard", "speed": "standard" }, "uuid": "e998ce5e-26d0-45e9-a630-873fb8b4246e" } ]