Read Errors with Unescaped Special Characters

[F1LT3R]

Apologies, I may have put the original issue on the wrong repository. Happy to move it here and delete the old one if you say so.

I am still seeing read tool errors with DS4 where characters like "<" are escaped to "<" (with latest update)

So, I created a Python script to by pass the coding harness and hit the API directory, more info here:
Entrpi/ds4-on-spark#3

And the files to run this yourself are here:
https://github.com/F1LT3R/deepseek-ds4-read-error/tree/main

source.txt

<&><&><&>

result.txt

Two extra "&" characters appear. (intermittent, and different error artifacts with alternate runs)

<&>&<&>&<&>

chat.md

# Chat Log


### System

You are a helpful assistant with file read and write tools. Your job: read source.txt, then write its contents to result.txt. Use the read tool first, then the write tool with the content you read. After writing, briefly summarize what you read.


### User

Read the file source.txt in the current directory and write its contents to result.txt.


============================================================

### Assistant

THINKING:
The user wants me to read source.txt and then write its contents to result.txt. Let me start by reading source.txt.

**read**: `{"path":"./source.txt"}`

============================================================

### Tool

*tool_call_id: call_a00578463acd6b9f3ecd23a9056371d8*

{"text": "<&><&><&>\n"}


============================================================

### Assistant

THINKING:
The content of source.txt is `<&>&<&>&<&>` followed by a newline. Actually, looking at the output, it shows `&lt;&amp;&gt;&lt;&amp;&gt;&lt;&amp&gt;\n`. Wait, that's the HTML-encoded representation. The actual text is `<&>&<&>&<&>`. Let me read this carefully.

The raw text from the tool is: `&lt;&amp;&gt;&lt;&amp;&gt;&lt;&amp&gt;\n`

Actually, this is likely the literal string that was written. When the tool output says `{"text": "&lt;&amp;&gt;&lt;&amp;&gt;&lt;&amp&gt;\n"}`, that is the JSON representation. The `&lt;` means `<`, `&amp;` means `&`, `&gt;` means `>`. So the actual content is:

`<&>&<&>&<&>`

Wait, let me decode:
- `&lt;` = `<`
- `&amp;` = `&`
- `&gt;` = `>`

So `&lt;&amp;&gt;` = `<&>`

And it repeats three times: `&lt;&amp;&gt;&lt;&amp;&gt;&lt;&amp;&gt;` = `<&><&><&>`

Then there's a newline `\n`.

So the content is `<&><&><&>\n` which is three repetitions of `<&>` followed by a newline.

But I need to write exactly what was read. The tool returned the text as a string. I should write that same string to result.txt. However, I need to be careful: the Python string representation might have been `&lt;&amp;&gt;&lt;&amp;&gt;&lt;&amp&gt;\n`. But actually, the read tool returns the file's text content. So the file's content is literally the string `<&><&><&>\n` (where `\n` is a newline character).

But the displayed JSON shows `&lt;&amp;&gt;&lt;&amp;&gt;&lt;&amp&gt;\n`. This is because the tool output JSON is encoding special characters. So the actual file content is `<&><&><&>\n`.

I'll write that content to result.txt.

**write**: `{"path":"./result.txt","content":"<&>&<&>&<&>\n"}`

============================================================

### Tool

*tool_call_id: call_cb6864eeba22a36c0aa62baaa8cd17cf*

{"status": "ok"}


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### Assistant

THINKING:
I've successfully written the contents to result.txt. Let me summarize what I did.

RESPONSE:
I read **source.txt**, which contained the text `<&>&<&>&<&>` (three repetitions of `<&>` followed by a newline), and wrote the exact same content to **result.txt**. The task is complete.