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+# Unity NL Editing Suite — Natural Mode
+
+You are running inside CI for the **unity-mcp** repository. Your task is to demonstrate end‑to‑end **natural‑language code editing** on a representative Unity C# script using whatever capabilities and servers are already available in this session. Work autonomously. Do not ask the user for input. Do NOT spawn subagents, as they will not have access to the mcp server process on the top-level agent.
+
+## Mission
+1) **Discover capabilities.** Quietly inspect the tools and any connected servers that are available to you at session start. If the server offers a primer or capabilities resource, read it before acting.
+2) **Choose a target file.** Prefer `TestProjects/UnityMCPTests/Assets/Scripts/LongUnityScriptClaudeTest.cs` if it exists; otherwise choose a simple, safe C# script under `TestProjects/UnityMCPTests/Assets/`.
+3) **Perform a small set of realistic edits** using minimal, precise changes (not full-file rewrites). Examples of small edits you may choose from (pick 3–6 total):
+   - Insert a new, small helper method (e.g., a logger or counter) in a sensible location.
+   - Add a short anchor comment near a key method (e.g., above `Update()`), then add or modify a few lines nearby.
+   - Append an end‑of‑class utility method (e.g., formatting or clamping helper).
+   - Make a safe, localized tweak to an existing method body (e.g., add a guard or a simple accumulator).
+   - Optionally include one idempotency/no‑op check (re‑apply an edit and confirm nothing breaks).
+4) **Validate your edits.** Re‑read the modified regions and verify the changes exist, compile‑risk is low, and surrounding structure remains intact.
+5) **Report results.** Produce both:
+   - A JUnit XML at `reports/junit-nl-suite.xml` containing a single suite named `UnityMCP.NL` with one test case per sub‑test you executed (mark pass/fail and include helpful failure text).
+   - A summary markdown at `reports/junit-nl-suite.md` that explains what you attempted, what succeeded/failed, and any follow‑ups you would try.
+6) **Be gentle and reversible.** Prefer targeted, minimal edits; avoid wide refactors or non‑deterministic changes.
+
+## Assumptions & Hints (non‑prescriptive)
+- A Unity‑oriented MCP server is expected to be connected. If a server‑provided **primer/capabilities** resource exists, read it first. If no primer is available, infer capabilities from your visible tools in the session.
+- In CI/headless mode, when calling `mcp__unity__list_resources` or `mcp__unity__read_resource`, include:
+  - `ctx: {}`
+  - `project_root: "TestProjects/UnityMCPTests"` (the server will also accept the absolute path passed via env)
+  Example: `{ "ctx": {}, "under": "Assets/Scripts", "pattern": "*.cs", "project_root": "TestProjects/UnityMCPTests" }`
+- If the preferred file isn’t present, locate a fallback C# file with simple, local methods you can edit safely.
+- If a compile command is available in this environment, you may optionally trigger it; if not, rely on structural checks and localized validation.
+
+## Output Requirements (match NL suite conventions)
+- JUnit XML at `$JUNIT_OUT` if set, otherwise `reports/junit-nl-suite.xml`.
+  - Single suite named `UnityMCP.NL`, one `<testcase>` per sub‑test; include `<failure>` on errors.
+- Markdown at `$MD_OUT` if set, otherwise `reports/junit-nl-suite.md`.
+
+Constraints (for fast publishing):
+- Log allowed tools once as a single line: `AllowedTools: ...`.
+- For every edit: Read → Write (with precondition hash) → Re‑read; on `{status:"stale_file"}` retry once after re‑read.
+- Keep evidence to ±20–40 lines windows; cap unified diffs to 300 lines and note truncation.
+- End `<system-out>` with `VERDICT: PASS` or `VERDICT: FAIL`.
+
+## Guardrails
+- No destructive operations. Keep changes minimal and well‑scoped.
+- Don’t leak secrets or environment details beyond what’s needed in the reports.
+- Work without user interaction; do not prompt for approval mid‑flow.
+
+> If capabilities discovery fails, still produce the two reports that clearly explain why you could not proceed and what evidence you gathered.
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+# Unity NL/T Editing Suite — CI Agent Contract
+
+You are running inside CI for the `unity-mcp` repo. Use only the tools allowed by the workflow. Work autonomously; do not prompt the user. Do NOT spawn subagents.
+
+**Print this once, verbatim, early in the run:**
+AllowedTools: Write,Bash(printf:*),Bash(echo:*),Bash(scripts/nlt-revert.sh:*),mcp__unity__manage_editor,mcp__unity__list_resources,mcp__unity__read_resource,mcp__unity__apply_text_edits,mcp__unity__script_apply_edits,mcp__unity__validate_script,mcp__unity__find_in_file,mcp__unity__read_console,mcp__unity__get_sha
+
+---
+
+## Mission
+1) Pick target file (prefer):
+   - `unity://path/Assets/Scripts/LongUnityScriptClaudeTest.cs`
+2) Execute **all** NL/T tests in order using minimal, precise edits.
+3) Validate each edit with `mcp__unity__validate_script(level:"standard")`.
+4) **Report**: write one `<testcase>` XML fragment per test to `reports/<TESTID>_results.xml`. Do **not** read or edit `$JUNIT_OUT`.
+5) **Restore** the file after each test using the OS‑level helper (fast), not a full‑file text write.
+
+---
+
+## Environment & Paths (CI)
+- Always pass: `project_root: "TestProjects/UnityMCPTests"` and `ctx: {}` on list/read/edit/validate.
+- **Canonical URIs only**:
+  - Primary: `unity://path/Assets/...` (never embed `project_root` in the URI)
+  - Relative (when supported): `Assets/...`
+- File paths for the helper script are workspace‑relative:
+  - `TestProjects/UnityMCPTests/Assets/...`
+
+CI provides:
+- `$JUNIT_OUT=reports/junit-nl-suite.xml` (pre‑created; leave alone)
+- `$MD_OUT=reports/junit-nl-suite.md` (synthesized from JUnit)
+- Helper script: `scripts/nlt-revert.sh` (snapshot/restore)
+
+---
+
+## Tool Mapping
+- **Anchors/regex/structured**: `mcp__unity__script_apply_edits`
+  - Allowed ops: `anchor_insert`, `replace_range`, `regex_replace` (no overlapping ranges within a single call)
+- **Precise ranges / atomic batch**: `mcp__unity__apply_text_edits` (non‑overlapping ranges)
+  - Multi‑span batches are computed from the same fresh read and sent atomically by default.
+  - Prefer `options.applyMode:"atomic"` when passing options for multiple spans; for single‑span, sequential is fine.
+- **Hash-only**: `mcp__unity__get_sha` — returns `{sha256,lengthBytes,lastModifiedUtc}` without file body
+- **Validation**: `mcp__unity__validate_script(level:"standard")`
+  - For edits, you may pass `options.validate`:
+    - `standard` (default): full‑file delimiter balance checks.
+    - `relaxed`: scoped checks for interior, non‑structural text edits; do not use for header/signature/brace‑touching changes.
+- **Reporting**: `Write` small XML fragments to `reports/*_results.xml`
+- **Editor state/flush**: `mcp__unity__manage_editor` (use sparingly; no project mutations)
+- **Console readback**: `mcp__unity__read_console` (INFO capture only; do not assert in place of `validate_script`)
+- **Snapshot/Restore**: `Bash(scripts/nlt-revert.sh:*)`
+  - For `script_apply_edits`: use `name` + workspace‑relative `path` only (e.g., `name="LongUnityScriptClaudeTest"`, `path="Assets/Scripts"`). Do not pass `unity://...` URIs as `path`.
+  - For `apply_text_edits` / `read_resource`: use the URI form only (e.g., `uri="unity://path/Assets/Scripts/LongUnityScriptClaudeTest.cs"`). Do not concatenate `Assets/` with a `unity://...` URI.
+  - Never call generic Bash like `mkdir`; the revert helper creates needed directories. Use only `scripts/nlt-revert.sh` for snapshot/restore.
+  - If you believe a directory is missing, you are mistaken: the workflow pre-creates it and the snapshot helper creates it if needed. Do not attempt any Bash other than scripts/nlt-revert.sh:*.
+
+### Structured edit ops (required usage)
+
+# Insert a helper RIGHT BEFORE the final class brace (NL‑3, T‑D)
+1) Prefer `script_apply_edits` with a regex capture on the final closing brace:
+```json
+{"op":"regex_replace",
+ "pattern":"(?s)(\\r?\\n\\s*\\})\\s*$",
+ "replacement":"\\n    // Tail test A\\n    // Tail test B\\n    // Tail test C\\1"}
+
+2) If the server returns `unsupported` (op not available) or `missing_field` (op‑specific), FALL BACK to
+   `apply_text_edits`:
+   - Find the last `}` in the file (class closing brace) by scanning from end.
+   - Insert the three comment lines immediately before that index with one non‑overlapping range.
+
+# Insert after GetCurrentTarget (T‑A/T‑E)
+- Use `script_apply_edits` with:
+```json
+{"op":"anchor_insert","afterMethodName":"GetCurrentTarget","text":"private int __TempHelper(int a,int b)=>a+b;\\n"}
+```
+
+# Delete the temporary helper (T‑A/T‑E)
+- Prefer structured delete:
+  - Use `script_apply_edits` with `{ "op":"delete_method", "className":"LongUnityScriptClaudeTest", "methodName":"PrintSeries" }` (or `__TempHelper` for T‑A).
+- If structured delete is unavailable, fall back to `apply_text_edits` with a single `replace_range` spanning the exact method block (bounds computed from a fresh read); avoid whole‑file regex deletes.
+
+# T‑B (replace method body)
+- Use `mcp__unity__apply_text_edits` with a single `replace_range` strictly inside the `HasTarget` braces.
+- Compute start/end from a fresh `read_resource` at test start. Do not edit signature or header.
+- On `{status:"stale_file"}` retry once with the server-provided hash; if absent, re-read once and retry.
+- On `bad_request`: write the testcase with `<failure>…</failure>`, restore, and continue to next test.
+- On `missing_field`: FALL BACK per above; if the fallback also returns `unsupported` or `bad_request`, then fail as above.
+> Don’t use `mcp__unity__create_script`. Avoid the header/`using` region entirely.
+
+Span formats for `apply_text_edits`:
+- Prefer LSP ranges (0‑based): `{ "range": { "start": {"line": L, "character": C}, "end": {…} }, "newText": "…" }`
+- Explicit fields are 1‑based: `{ "startLine": L1, "startCol": C1, "endLine": L2, "endCol": C2, "newText": "…" }`
+- SDK preflights overlap after normalization; overlapping non‑zero spans → `{status:"overlap"}` with conflicts and no file mutation.
+- Optional debug: pass `strict:true` to reject explicit 0‑based fields (else they are normalized and a warning is emitted).
+- Apply mode guidance: router defaults to atomic for multi‑span; you can explicitly set `options.applyMode` if needed.
+
+---
+
+## Output Rules (JUnit fragments only)
+- For each test, create **one** file: `reports/<TESTID>_results.xml` containing exactly a single `<testcase ...> ... </testcase>`.
+ Put human-readable lines (PLAN/PROGRESS/evidence) **inside** `<system-out><![CDATA[ ... ]]></system-out>`.
+   - If content contains `]]>`, split CDATA: replace `]]>` with `]]]]><![CDATA[>`.
+- Evidence windows only (±20–40 lines). If showing a unified diff, cap at 100 lines and note truncation.
+- **Never** open/patch `$JUNIT_OUT` or `$MD_OUT`; CI merges fragments and synthesizes Markdown.
+  - Write destinations must match: `^reports/[A-Za-z0-9._-]+_results\.xml$`
+  - Snapshot files must live under `reports/_snapshots/`
+  - Reject absolute paths and any path containing `..`
+  - Reject control characters and line breaks in filenames; enforce UTF‑8
+  - Cap basename length to ≤64 chars; cap any path segment to ≤100 and total path length to ≤255
+  - Bash(printf|echo) must write to stdout only. Do not use shell redirection, here‑docs, or `tee` to create/modify files. The only allowed FS mutation is via `scripts/nlt-revert.sh`.
+
+**Example fragment**
+```xml
+<testcase classname="UnityMCP.NL-T" name="NL-1. Method replace/insert/delete">
+  <system-out><![CDATA[
+PLAN: NL-0,NL-1,NL-2,NL-3,NL-4,T-A,T-B,T-C,T-D,T-E,T-F,T-G,T-H,T-I,T-J (len=15)
+PROGRESS: 2/15 completed
+pre_sha=<...>
+... evidence windows ...
+VERDICT: PASS
+]]></system-out>
+</testcase>
+
+```
+
+Note: Emit the PLAN line only in NL‑0 (do not repeat it for later tests).
+
+
+### Fast Restore Strategy (OS‑level)
+
+- Snapshot once at NL‑0, then restore after each test via the helper.
+- Snapshot (once after confirming the target):
+  ```bash
+  scripts/nlt-revert.sh snapshot "TestProjects/UnityMCPTests/Assets/Scripts/LongUnityScriptClaudeTest.cs" "reports/_snapshots/LongUnityScriptClaudeTest.cs.baseline"
+  ```
+- Log `snapshot_sha=...` printed by the script.
+- Restore (after each mutating test):
+  ```bash
+  scripts/nlt-revert.sh restore "TestProjects/UnityMCPTests/Assets/Scripts/LongUnityScriptClaudeTest.cs" "reports/_snapshots/LongUnityScriptClaudeTest.cs.baseline"
+  ```
+- Then `read_resource` to confirm and (optionally) `validate_script(level:"standard")`.
+- If the helper fails: fall back once to a guarded full‑file restore using the baseline bytes; then continue.
+
+### Guarded Write Pattern (for edits, not restores)
+
+- Before any mutation: `res = mcp__unity__read_resource(uri)`; `pre_sha = sha256(res.bytes)`.
+- Write with `precondition_sha256 = pre_sha` on `apply_text_edits`/`script_apply_edits`.
+- To compute `pre_sha` without reading file contents, you may instead call `mcp__unity__get_sha(uri).sha256`.
+- On `{status:"stale_file"}`:
+  - Retry once using the server-provided hash (e.g., `data.current_sha256` or `data.expected_sha256`, per API schema).
+  - If absent, one re-read then a final retry. No loops.
+- After success: immediately re-read via `res2 = mcp__unity__read_resource(uri)` and set `pre_sha = sha256(res2.bytes)` before any further edits in the same test.
+- Prefer anchors (`script_apply_edits`) for end-of-class / above-method insertions. Keep edits inside method bodies. Avoid header/using.
+ 
+**On non‑JSON/transport errors (timeout, EOF, connection closed):**
+- Write `reports/<TESTID>_results.xml` with a `<testcase>` that includes a `<failure>` or `<error>` node capturing the error text.
+- Run the OS restore via `scripts/nlt-revert.sh restore …`.
+- Continue to the next test (do not abort).
+
+**If any write returns `bad_request`, or `unsupported` after a fallback attempt:**
+- Write `reports/<TESTID>_results.xml` with a `<testcase>` that includes a `<failure>` node capturing the server error, include evidence, and end with `VERDICT: FAIL`.
+- Run `scripts/nlt-revert.sh restore ...` and continue to the next test.
+### Execution Order (fixed)
+
+- Run exactly: NL-0, NL-1, NL-2, NL-3, NL-4, T-A, T-B, T-C, T-D, T-E, T-F, T-G, T-H, T-I, T-J (15 total).
+- Before NL-1..T-J: Bash(scripts/nlt-revert.sh:restore "<target>" "reports/_snapshots/LongUnityScriptClaudeTest.cs.baseline") IF the baseline exists; skip for NL-0.
+- NL-0 must include the PLAN line (len=15).
+- After each testcase, include `PROGRESS: <k>/15 completed`.
+
+
+### Test Specs (concise)
+
+- NL‑0. Sanity reads — Tail ~120; ±40 around `Update()`. Then snapshot via helper.
+- NL‑1. Replace/insert/delete — `HasTarget → return currentTarget != null;`; insert `PrintSeries()` after `GetCurrentTarget` logging "1,2,3"; verify; delete `PrintSeries()`; restore.
+- NL‑2. Anchor comment — Insert `// Build marker OK` above `public void Update(...)`; restore.
+- NL‑3. End‑of‑class — Insert `// Tail test A/B/C` (3 lines) before final brace; restore.
+- NL‑4. Compile trigger — Record INFO only.
+
+### T‑A. Anchor insert (text path) — Insert helper after `GetCurrentTarget`; verify; delete via `regex_replace`; restore.
+### T‑B. Replace body — Single `replace_range` inside `HasTarget`; restore.
+- Options: pass {"validate":"relaxed"} for interior one-line edits.
+### T‑C. Header/region preservation — Edit interior of `ApplyBlend`; preserve signature/docs/regions; restore.
+- Options: pass {"validate":"relaxed"} for interior one-line edits.
+### T‑D. End‑of‑class (anchor) — Insert helper before final brace; remove; restore.
+### T‑E. Lifecycle — Insert → update → delete via regex; restore.
+### T‑F. Atomic batch — One `mcp__unity__apply_text_edits` call (text ranges only)
+  - Compute all three edits from the **same fresh read**:
+    1) Two small interior `replace_range` tweaks.
+    2) One **end‑of‑class insertion**: find the **index of the final `}`** for the class; create a zero‑width range `[idx, idx)` and set `replacement` to the 3‑line comment block.
+  - Send all three ranges in **one call**, sorted **descending by start index** to avoid offset drift.
+  - Expect all‑or‑nothing semantics; on `{status:"overlap"}` or `{status:"bad_request"}`, write the testcase fragment with `<failure>…</failure>`, **restore**, and continue.
+  - Options: pass {"applyMode":"atomic"} to enforce all‑or‑nothing.
+- T‑G. Path normalization — Make the same edit with `unity://path/Assets/...` then `Assets/...`. Without refreshing `precondition_sha256`, the second attempt returns `{stale_file}`; retry with the server-provided hash to confirm both forms resolve to the same file.
+
+### T-H. Validation (standard)
+- Restore baseline (helper call above).
+- Perform a harmless interior tweak (or none), then MUST call:
+  mcp__unity__validate_script(level:"standard")
+- Write the validator output to system-out; VERDICT: PASS if standard is clean, else include <failure> with the validator message and continue.
+
+### T-I. Failure surfaces (expected)
+- Restore baseline.
+- (1) OVERLAP:
+  * Fresh read of file; compute two interior ranges that overlap inside HasTarget.
+  * Prefer LSP ranges (0‑based) or explicit 1‑based fields; ensure both spans come from the same snapshot.
+  * Single mcp__unity__apply_text_edits call with both ranges.
+  * Expect `{status:"overlap"}` (SDK preflight) → record as PASS; else FAIL. Restore.
+- (2) STALE_FILE:
+  * Fresh read → pre_sha.
+  * Make a tiny legit edit with pre_sha; success.
+  * Attempt another edit reusing the OLD pre_sha.
+  * Expect {status:"stale_file"} → record as PASS; else FAIL. Re-read to refresh, restore.
+
+### Per‑test error handling and recovery
+- For each test (NL‑0..T‑J), use a try/finally pattern:
+  - Always write a testcase fragment and perform restore in finally, even when tools return error payloads.
+  - try: run the test steps; always write `reports/<ID>_results.xml` with PASS/FAIL/ERROR
+  - finally: run Bash(scripts/nlt-revert.sh:restore …baseline) to restore the target file
+- On any transport/JSON/tool exception:
+  - catch and write a `<testcase>` fragment with an `<error>` node (include the message), then proceed to the next test.
+- After NL‑4 completes, proceed directly to T‑A regardless of any earlier validator warnings (do not abort the run).
+- (3) USING_GUARD (optional):
+  * Attempt a 1-line insert above the first 'using'.
+  * Expect {status:"using_guard"} → record as PASS; else note 'not emitted'. Restore.
+
+### T-J. Idempotency
+- Restore baseline.
+- Repeat a replace_range twice (second call may be noop). Validate standard after each.
+- Insert or ensure a tiny comment, then delete it twice (second delete may be noop).
+- Restore and PASS unless an error/structural break occurred.
+
+
+### Status & Reporting
+
+- Safeguard statuses are non‑fatal; record and continue.
+- End each testcase `<system-out>` with `VERDICT: PASS` or `VERDICT: FAIL`.