diff --git a/docs/spec.md b/docs/spec.md
index 27a268c..07b40d4 100644
--- a/docs/spec.md
+++ b/docs/spec.md
@@ -306,6 +306,7 @@ When `transport = "link"`, the `data` field contains a URL pointing to the uploa
 | Platform | Input Type | Serialization | Encoding |
 |----------|------------|---------------|----------|
 | All | `Vector{Dict}`/`Array<Object>` | JSON array | Base64 or direct JSON |
+| Desktop | `pandas.DataFrame` | JSON array | Base64 or direct JSON |
 
 ### Binary Serialization
 
@@ -642,13 +643,20 @@ flowchart TD
 
 ### Unit Test Validation
 
-| Test | Input | Expected Output |
-|------|-------|-----------------|
-| Text round-trip | `("msg", "Hello", "text")` | `("msg", "Hello", "text")` |
-| Dictionary round-trip | `("data", {"key": "value"}, "dictionary")` | `("data", {"key": "value"}, "dictionary")` |
-| Arrow table round-trip | `("table", DataFrame(...), "arrowtable")` | `("table", DataFrame(...), "arrowtable")` |
-| Mixed payloads | `[("text", "Hello", "text"), ("img", bytes, "image")]` | `[("text", "Hello", "text"), ("img", bytes, "image")]` |
-| Large payload | `("data", rand(10_000_000), "arrowtable")` | `("data", URL, "arrowtable")` with link transport |
+| Test | Input | Expected Output | Notes |
+|------|-------|-----------------|-------|
+| Text round-trip | `("msg", "Hello", "text")` | `("msg", "Hello", "text")` | String serialization |
+| Dictionary round-trip | `("data", {"key": "value"}, "dictionary")` | `("data", {"key": "value"}, "dictionary")` | JSON object round-trip |
+| Arrow table round-trip | `("table", arrow_table_data, "arrowtable")` | `("table", arrow_table_data, "arrowtable")` | Arrow IPC round-trip |
+| JSON table round-trip | `("table", [{"a":1},{"b":2}], "jsontable")` | `("table", [{"a":1},{"b":2}], "jsontable")` | JSON array of objects |
+| Mixed payloads | `[("text", "Hello", "text"), ("img", bytes, "image")]` | `[("text", "Hello", "text"), ("img", bytes, "image")]` | Multiple payload types |
+| Large payload | `("data", rand(10_000_000), "arrowtable")` | `("data", URL, "arrowtable")` with link transport | File server upload |
+
+**Platform-Specific Notes:**
+- **Julia**: Use `Dict`, `Vector{Dict}`, or convert `DataFrame` to dictionary for testing
+- **Python**: Use `dict`, `list[dict]`, or convert `pandas.DataFrame` to dictionary for testing  
+- **JavaScript**: Use plain objects `{}` and arrays `[]`
+- **MicroPython**: Use plain `dict` and `list` (limited to JSON table and text types)
 
 ### Integration Test Scenarios
 
@@ -658,6 +666,8 @@ flowchart TD
 | Python ↔ Julia | Arrow table | Arrow IPC round-trip |
 | JavaScript ↔ Python | Mixed content | All payloads preserved |
 | Large file transfer | All platforms | File server upload/download |
+| Cross-platform JSON table | All platforms | Dictionary array round-trip |
+| MicroPython ↔ Desktop | Text, dictionary only | Limited payload types |
 
 ---