Add Sprints 111-117: closed-loop iteration epoch
Sprint 111: IterationSession context primitive Sprint 112: EnvironmentSnapshot and diff Sprint 113: Build output feedback loop Sprint 114: Test failure feedback loop Sprint 115: Requirements derivation from AST Sprint 116: FeedbackLoopOrchestrator (wires 111-115) Sprint 117: HiveMind integration (iteration steps as distributed jobs) These sprints begin Epoch 3 — closed-loop determinism. Sprints 1-110 made code generation open-loop deterministic. Sprints 111+ make the full dev workflow (sense→act→observe→repeat) structurally deterministic, with HiveMind as the execution layer. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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sprint111_plan.md
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sprint111_plan.md
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# Sprint 111 Plan: Iteration Session Context
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## Context
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Sprints 1-110 established Whetstone as a deterministic *open-loop* generator:
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schema → struct, spec → taskitems, source → transpiled output. The output is
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fully determined by the input, with no environmental state involved.
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Sprint 111 begins a new capability tier: **closed-loop iteration**. Real
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development is not open-loop. It involves running code, observing what breaks,
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forming a hypothesis, patching, and repeating until a goal is met. This sprint
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introduces the foundational primitive for that loop: the `IterationSession`.
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An `IterationSession` is a structured record of one attempt to achieve a
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convergence goal (all tests pass, build succeeds, environment is ready). It
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tracks: the goal, each attempt taken, each observation made, and the current
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distance from the goal. Every subsequent sprint in this epoch builds on it.
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---
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## Goals
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1. Define the `IterationSession` schema with goal, attempt history, and state
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2. Define `AttemptRecord` and `ObservationRecord` as structured sub-types
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3. Define `GapModel` to measure distance from the convergence goal
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4. Implement a state machine: pending → active → converged / escalated / failed
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5. Persist sessions to sidecar files alongside annotated ASTs
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---
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## Steps
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### Step 1339: `IterationSession` core schema (12 tests)
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Create `editor/src/IterationSession.h`.
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Fields: `session_id`, `goal` (string), `goal_type` (enum: build_success,
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tests_pass, environment_ready, custom), `status` (enum: pending, active,
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converged, escalated, failed), `created_at`, `updated_at`, `attempts[]`,
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`max_attempts` (default 10).
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Tests (12): constructable with defaults, goal stored, goal_type round-trips,
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status defaults to pending, session_id is non-empty on construction,
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attempt list starts empty, max_attempts enforced, JSON serialization,
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JSON deserialization, unknown status survives passthrough,
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deterministic serialization order, schema version field present.
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### Step 1340: `AttemptRecord` schema (10 tests)
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Create `editor/src/AttemptRecord.h`.
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Fields: `attempt_id`, `session_id`, `action_type` (enum: build, test, patch,
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probe, escalate), `action_description`, `started_at`, `completed_at`,
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`outcome` (enum: success, failure, partial, error), `observation_id`.
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Tests (10): constructable, action_type round-trips, outcome defaults to error,
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duration computable from timestamps, JSON round-trip, unknown action_type
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passthrough, attempt_id non-empty, links to session_id, links to observation_id,
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deterministic serialization.
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### Step 1341: `ObservationRecord` schema (10 tests)
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Create `editor/src/ObservationRecord.h`.
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Fields: `observation_id`, `source` (enum: build_output, test_output,
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process_stdout, process_stderr, file_read, env_probe), `raw_text`,
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`exit_code`, `duration_ms`, `structured_data` (JSON blob for parsed output),
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`truncated` (bool — raw_text may be capped at 16KB).
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Tests (10): constructable, source enum round-trips, exit_code defaults to -1,
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truncated flag set when raw_text exceeds limit, structured_data round-trips,
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JSON serialization, deserialization, unknown source passthrough,
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observation_id non-empty, deterministic output.
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### Step 1342: `GapModel` — distance from convergence goal (10 tests)
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Create `editor/src/GapModel.h`.
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Fields: `metric_type` (enum: error_count, test_failure_count, missing_deps,
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custom), `current_value`, `target_value`, `delta`, `converged` (bool —
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true when current_value == target_value), `trend` (enum: improving,
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stagnant, worsening — derived from last two values).
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Tests (10): converged true when delta is zero, trend improving when delta
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decreasing, trend worsening when delta increasing, stagnant after two equal
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values, JSON round-trip, negative delta flagged as worsening, custom metric
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type passthrough, deterministic output, delta auto-computed, schema constructable.
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### Step 1343: Session state machine transitions (10 tests)
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Add `SessionStateMachine` to `IterationSession.h` (or small companion header).
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Valid transitions:
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- pending → active (on first attempt recorded)
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- active → converged (on gap.converged == true)
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- active → escalated (on max_attempts reached without convergence)
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- active → failed (on attempt with outcome=error and no recovery path)
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- Any terminal state is immutable.
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Tests (10): pending→active on first attempt, active→converged when gap closes,
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active→escalated at max_attempts, active→failed on terminal error,
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illegal transition rejected, terminal states immutable, state serialized,
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state deserialized, history preserved through transitions, deterministic
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transition log.
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### Step 1344: Session persistence to sidecar file (10 tests)
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Add `SessionStore` to a new `editor/src/SessionStore.h`.
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Sidecar path convention: `.whetstone/sessions/<session_id>.json` relative
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to workspace root. `SessionStore::save(session)` writes atomically (write
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to `.tmp` then rename). `SessionStore::load(session_id)` reads and
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deserializes. `SessionStore::list()` returns all session IDs in the store.
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Tests (10): save creates file, load round-trips session, list returns saved ids,
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overwrite preserves new state, missing session returns nullopt, atomic write
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(partial write does not corrupt), path derivation from workspace root,
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concurrent save does not corrupt (file lock), deterministic file layout,
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sidecar dir created on first save.
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### Step 1345: `whetstone_start_iteration_session` MCP tool (8 tests)
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Create `editor/src/mcp/RegisterIterationSessionTools.h`.
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Input: `{ "goal": string, "goal_type": string, "max_attempts": int? }`
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Output: `{ "session_id": string, "status": "pending" }`
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Persists session to SessionStore immediately on creation.
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Tests (8): tool registered, schema validates, session_id returned,
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status is pending, session persisted to disk, missing goal_type defaults
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to "custom", max_attempts defaults to 10, deterministic output shape.
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### Step 1346: `whetstone_record_attempt` MCP tool (8 tests)
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Input: `{ "session_id": string, "action_type": string,
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"action_description": string, "observation": { ... } }`
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Output: `{ "attempt_id": string, "session_status": string, "gap": { ... }? }`
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Appends AttemptRecord + ObservationRecord to session. Returns updated
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session status after state machine step.
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Tests (8): tool registered, attempt appended, session_status updated,
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unknown session_id returns error, illegal transition returns error,
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gap field present when gap model updated, deterministic output,
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session persisted after record.
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### Step 1347: `whetstone_get_session_state` MCP tool (8 tests)
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Input: `{ "session_id": string }`
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Output: full session JSON with attempts[], gap, and current status.
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Tests (8): tool registered, full session returned, attempts included,
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gap included when present, terminal sessions readable, missing session
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returns structured error, deterministic serialization, attempt count correct.
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### Step 1348: Sprint 111 integration summary + regression (8 tests)
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Create `editor/src/Sprint111IntegrationSummary.h`.
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Tests (8): all new headers constructable, tools registered in initialize
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response, session round-trip end-to-end (start → record × 2 → converge →
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read), state machine covers all transitions, sidecar created on disk,
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no header exceeds 600 lines, deterministic snapshots, full prior regression
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passes.
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---
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## Architecture Gate
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- Max 600 lines per header — split `IterationSessionExtended.h` if needed
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- No runtime dependencies beyond nlohmann-json and std::filesystem
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- Session IDs use UUIDv4 (reuse existing UUID utility if present, else add one)
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- All MCP tool outputs are stable and machine-readable
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- Sidecar format is versioned (`"schema_version": 1`)
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