feat(prompts/tools): clarified hashline block boundary handling with examples

- Improved hashline tool documentation with clearer guidance on block boundary handling and closing delimiter duplication prevention.
- Added concrete example demonstrating correct anchor placement when replacing entire blocks including closing braces.
- Reorganized boundary duplication warnings into actionable self-check guidance with visual comparison steps.

packages/ai/src/models.json

@@ -822,7 +822,7 @@
 		},
 		"global.anthropic.claude-haiku-4-5-20251001-v1:0": {
 			"id": "global.anthropic.claude-haiku-4-5-20251001-v1:0",
-			"name": "Claude Haiku 4.5 (Global)",
+			"name": "Claude Haiku 4.5",
 			"api": "bedrock-converse-stream",
 			"provider": "amazon-bedrock",
 			"baseUrl": "https://bedrock-runtime.us-east-1.amazonaws.com",
@@ -947,7 +947,7 @@
 		},
 		"global.anthropic.claude-sonnet-4-6": {
 			"id": "global.anthropic.claude-sonnet-4-6",
-			"name": "Claude Sonnet 4.6",
+			"name": "Claude Sonnet 4.6 (Global)",
 			"api": "bedrock-converse-stream",
 			"provider": "amazon-bedrock",
 			"baseUrl": "https://bedrock-runtime.us-east-1.amazonaws.com",
@@ -1801,7 +1801,7 @@
 		},
 		"us.anthropic.claude-opus-4-1-20250805-v1:0": {
 			"id": "us.anthropic.claude-opus-4-1-20250805-v1:0",
-			"name": "Claude Opus 4.1",
+			"name": "Claude Opus 4.1 (US)",
 			"api": "bedrock-converse-stream",
 			"provider": "amazon-bedrock",
 			"baseUrl": "https://bedrock-runtime.us-east-1.amazonaws.com",
@@ -25896,6 +25896,31 @@
 			"contextWindow": 222222,
 			"maxTokens": 8888
 		},
+		"qwen/qwen3.5-9b": {
+			"id": "qwen/qwen3.5-9b",
+			"name": "Qwen: Qwen3.5-9B",
+			"api": "openai-completions",
+			"provider": "nanogpt",
+			"baseUrl": "https://nano-gpt.com/api/v1",
+			"reasoning": true,
+			"input": [
+				"text",
+				"image"
+			],
+			"cost": {
+				"input": 0.049999999999999996,
+				"output": 0.15,
+				"cacheRead": 0,
+				"cacheWrite": 0
+			},
+			"contextWindow": 256000,
+			"maxTokens": 65536,
+			"thinking": {
+				"mode": "effort",
+				"minLevel": "minimal",
+				"maxLevel": "high"
+			}
+		},
 		"qwen/qwen3.5-plus": {
 			"id": "qwen/qwen3.5-plus",
 			"name": "Qwen3.5 Plus",
@@ -37505,8 +37530,8 @@
 				"image"
 			],
 			"cost": {
-				"input": 0.19999999999999998,
-				"output": 0.19999999999999998,
+				"input": 0.09999999999999999,
+				"output": 0.09999999999999999,
 				"cacheRead": 0,
 				"cacheWrite": 0
 			},

packages/coding-agent/CHANGELOG.md

@@ -1,7 +1,6 @@
 # Changelog
 
 ## [Unreleased]
-
 ### Added
 
 - Implemented root path alias: bare `/` in tool inputs now resolves to the session working directory instead of the filesystem root
@@ -9,6 +8,7 @@
 
 ### Changed
 
+- Improved hashline tool documentation with clearer guidance on block boundary handling and closing delimiter duplication prevention
 - Updated screenshot path resolution to use `resolveToCwd` for consistent workspace-relative path handling
 - Updated hook editor hint text to include `ctrl+g external editor` option when using prompt style
 - Refactored question result formatting to consistently include question ID in output

packages/coding-agent/src/prompts/tools/hashline.md

@@ -2,8 +2,6 @@ Applies precise file edits using `LINE#ID` anchors from `read` output.
 
 Read the file first. Copy anchors exactly from the latest `read` output. In one `edit` call, batch all edits for one file. After any successful edit, re-read before editing that file again.
 
-This matters: your output is checked against the real file state. Invalid anchors, duplicated boundary lines, or semantically equivalent rewrites will fail.
-
 <operations>
 **Top level**
 - `path` — file path
@@ -61,6 +59,24 @@ Replace only the catch body. Do not target the shared boundary line `} catch (er
 ```
 </example>
 
+<example name="replace whole block including closing brace">
+Replace the entire body of `alpha`, including its closing `}`. `end` **MUST** be {{hlineref 7 "}"}} because `content` includes `}`.
+```
+{
+  path: "util.ts",
+  edits: [{
+    loc: { block: { pos: {{hlineref 6 "\tlog();"}}, end: {{hlineref 7 "}"}} } },
+    content: [
+      "\tvalidate();",
+      "\tlog();",
+      "}"
+    ]
+  }]
+}
+```
+**Wrong**: using `end: {{hlineref 6 "\tlog();"}}` with the same content — line 7 (`}`) survives the replacement AND content emits `}`, producing two closing braces.
+</example>
+
 <example name="replace one line">
 ```
 {
@@ -108,9 +124,8 @@ When adding a sibling declaration, prefer `prepend` on the next declaration.
 - Make the minimum exact edit. Do not rewrite nearby code unless the consumed range requires it.
 - Use anchors exactly as `N#ID` from the latest `read` output.
 - `block` requires both `pos` and `end`. Other anchored ops require one anchor.
-- Replace exactly the owned span. If `content` re-emits content beyond `end`, it will duplicate.
-- **Boundary duplication trap**: when replacing a block, `end` must be the **last line of the block** (e.g. the closing `}`), not the last *content* line before it. Otherwise the closing delimiter survives and your replacement adds a second copy.
-- Do not target shared boundary lines such as `} else {`, `} catch (…) {`, `}),`, or `},{`.
+- When your replacement `content` ends with a closing delimiter (`}`, `*/`, `)`, `]`), verify `end` includes the original line carrying that delimiter. If `end` stops one line too early, the original delimiter survives and your content adds a second copy.
+- **Self-check**: compare the last line of `content` with the line immediately after `end` in the file. If they match (e.g., both are `}`), extend `end` to include that line.
 - For a block, either replace only the body or replace the whole block. Do not split block boundaries.
 - `content` must be literal file content with matching indentation. If the file uses tabs, use real tabs.
 - Do not use this tool to reformat or clean up unrelated code.