Add jqschema middleware for tool call response transformation

go.mod

@@ -10,6 +10,20 @@ require (
 )
 
 require (
+	github.com/itchyny/gojq v0.12.18
 	github.com/santhosh-tekuri/jsonschema/v5 v5.3.1
 	github.com/stretchr/testify v1.11.1
 )
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/google/jsonschema-go v0.3.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/itchyny/timefmt-go v0.1.7 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
+	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
+	golang.org/x/oauth2 v0.30.0 // indirect
+	golang.org/x/sys v0.39.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -1,18 +1,18 @@
-cloud.google.com/go/compute/metadata v0.3.0/go.mod h1:zFmK7XCadkQkj6TtorcaGlCW1hT1fIilQDwofLpJ20k=
 github.com/BurntSushi/toml v1.5.0 h1:W5quZX/G/csjUnuI8SUYlsHs9M38FC7znL0lIO+DvMg=
 github.com/BurntSushi/toml v1.5.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
 github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/golang-jwt/jwt/v5 v5.2.2/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
-github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/google/jsonschema-go v0.3.0 h1:6AH2TxVNtk3IlvkkhjrtbUc4S8AvO0Xii0DxIygDg+Q=
 github.com/google/jsonschema-go v0.3.0/go.mod h1:r5quNTdLOYEz95Ru18zA0ydNbBuYoo9tgaYcxEYhJVE=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/itchyny/gojq v0.12.18 h1:gFGHyt/MLbG9n6dqnvlliiya2TaMMh6FFaR2b1H6Drc=
+github.com/itchyny/gojq v0.12.18/go.mod h1:4hPoZ/3lN9fDL1D+aK7DY1f39XZpY9+1Xpjz8atrEkg=
+github.com/itchyny/timefmt-go v0.1.7 h1:xyftit9Tbw+Dc/huSSPJaEmX1TVL8lw5vxjJLK4GMMA=
+github.com/itchyny/timefmt-go v0.1.7/go.mod h1:5E46Q+zj7vbTgWY8o5YkMeYb4I6GeWLFnetPy5oBrAI=
 github.com/modelcontextprotocol/go-sdk v1.1.0 h1:Qjayg53dnKC4UZ+792W21e4BpwEZBzwgRW6LrjLWSwA=
 github.com/modelcontextprotocol/go-sdk v1.1.0/go.mod h1:6fM3LCm3yV7pAs8isnKLn07oKtB0MP9LHd3DfAcKw10=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
@@ -24,100 +24,20 @@ github.com/spf13/cobra v1.10.2 h1:DMTTonx5m65Ic0GOoRY2c16WCbHxOOw6xxezuLaBpcU=
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 github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
-github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
-github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
-github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
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internal/middleware/README.md

@@ -0,0 +1,165 @@
+# jqschema Middleware
+
+This middleware package implements the jqschema functionality from the gh-aw shared agentic workflow as a tool call middleware for the MCP Gateway.
+
+## Features
+
+- **Automatic JSON Schema Inference**: Uses the jq schema transformation logic to automatically infer the structure and types of JSON responses
+- **Payload Storage**: Stores complete response payloads in `/tmp/gh-awmg/tools-calls/{randomID}/payload.json`
+- **Response Rewriting**: Returns a transformed response containing:
+  - First 500 characters of the payload (for quick preview)
+  - Inferred JSON schema showing structure and types
+  - Query ID for tracking
+  - File path to complete payload
+  - Metadata (original size, truncation status)
+
+## How It Works
+
+The middleware wraps tool handlers and intercepts their responses:
+
+1. **Random ID Generation**: Each tool call gets a unique random ID (32 hex characters)
+2. **Original Handler Execution**: The original tool handler is called normally
+3. **Payload Storage**: The complete response is saved to disk
+4. **Schema Inference**: The jq schema transformation is applied to extract types and structure
+5. **Response Rewriting**: A new response is returned with preview + schema
+
+## Usage
+
+The middleware is automatically applied to all backend MCP server tools (except `sys___*` tools).
+
+### Example Response
+
+**Original response:**
+```json
+{
+  "total_count": 1000,
+  "items": [
+    {
+      "login": "user1",
+      "id": 123,
+      "verified": true
+    },
+    {
+      "login": "user2",
+      "id": 456,
+      "verified": false
+    }
+  ]
+}
+```
+
+**Transformed response:**
+```json
+{
+  "queryID": "a1b2c3d4e5f6...",
+  "payloadPath": "/tmp/gh-awmg/tools-calls/a1b2c3d4e5f6.../payload.json",
+  "preview": "{\"total_count\":1000,\"items\":[{\"login\":\"user1\",\"id\":123,\"verified\":true}...",
+  "schema": {
+    "total_count": "number",
+    "items": [
+      {
+        "login": "string",
+        "id": "number",
+        "verified": "boolean"
+      }
+    ]
+  },
+  "originalSize": 234,
+  "truncated": false
+}
+```
+
+## Implementation Details
+
+### jq Schema Filter
+
+The middleware uses the same jq filter logic as the gh-aw jqschema utility:
+
+```jq
+def walk(f):
+  . as $in |
+  if type == "object" then
+    reduce keys[] as $k ({}; . + {($k): ($in[$k] | walk(f))})
+  elif type == "array" then
+    if length == 0 then [] else [.[0] | walk(f)] end
+  else
+    type
+  end;
+walk(.)
+```
+
+This recursively walks the JSON structure and replaces values with their type names.
+
+### Go Implementation
+
+The middleware is implemented using [gojq](https://github.com/itchyny/gojq), a pure Go implementation of jq, eliminating the need to spawn external processes.
+
+## Configuration
+
+The middleware can be controlled via the `ShouldApplyMiddleware` function:
+
+```go
+func ShouldApplyMiddleware(toolName string) bool {
+    // Currently excludes sys tools
+    return !strings.HasPrefix(toolName, "sys___")
+}
+```
+
+### Future Enhancements
+
+**Selective Middleware Mounting**: A configuration system could be added to:
+- Enable/disable middleware per backend server
+- Configure which tools get middleware applied
+- Set custom truncation limits
+- Configure storage locations
+- Add multiple middleware types with ordering
+
+Example future config structure:
+```toml
+[middleware.jqschema]
+enabled = true
+truncate_at = 500
+storage_path = "/tmp/gh-awmg/tools-calls"
+exclude_tools = ["sys___*"]
+include_backends = ["github", "tavily"]
+```
+
+## Testing
+
+The middleware includes comprehensive tests:
+
+- **Unit tests**: Test individual functions (random ID generation, schema transformation, payload storage)
+- **Integration tests**: Test complete middleware flow with mock handlers
+- **Edge cases**: Test error handling, large payloads, truncation behavior
+
+Run tests:
+```bash
+make test-unit
+# or
+go test ./internal/middleware/...
+```
+
+## Directory Structure
+
+Payloads are stored in:
+```
+/tmp/gh-awmg/tools-calls/
+  ├── {randomID1}/
+  │   └── payload.json
+  ├── {randomID2}/
+  │   └── payload.json
+  └── ...
+```
+
+## Benefits
+
+1. **Reduced Token Usage**: Preview + schema is much smaller than full responses
+2. **Better Understanding**: Schema shows structure without verbose data
+3. **Audit Trail**: Complete payloads are saved for later inspection
+4. **Debugging**: Query IDs enable tracking and correlation
+5. **Performance**: Pure Go implementation (no external process spawning)
+
+## References
+
+- Original jqschema utility: [gh-aw/.github/workflows/shared/jqschema.md](https://github.com/githubnext/gh-aw/blob/main/.github/workflows/shared/jqschema.md)
+- gojq library: [github.com/itchyny/gojq](https://github.com/itchyny/gojq)

internal/middleware/demo.sh

@@ -0,0 +1,77 @@
+#!/bin/bash
+# Demo script to show jqschema middleware in action
+
+set -e
+
+echo "=== jqschema Middleware Demo ==="
+echo ""
+echo "This demo shows how the jqschema middleware transforms tool call responses."
+echo ""
+
+# Create a test directory
+TEST_DIR="/tmp/gh-awmg-demo"
+rm -rf "$TEST_DIR"
+mkdir -p "$TEST_DIR"
+
+echo "1. The middleware intercepts tool call responses"
+echo "2. Generates a unique random ID for each call"
+echo "3. Saves the complete payload to /tmp/gh-awmg/tools-calls/{ID}/payload.json"
+echo "4. Infers the JSON schema using jq logic"
+echo "5. Returns a transformed response with:"
+echo "   - First 500 chars of payload (preview)"
+echo "   - Inferred schema (types and structure)"
+echo "   - Query ID, file path, and metadata"
+echo ""
+
+echo "=== Example Transformation ==="
+echo ""
+echo "Original Response:"
+echo "{"
+echo "  \"total_count\": 1000,"
+echo "  \"items\": ["
+echo "    {\"login\": \"user1\", \"id\": 123, \"verified\": true},"
+echo "    {\"login\": \"user2\", \"id\": 456, \"verified\": false}"
+echo "  ]"
+echo "}"
+echo ""
+
+echo "Transformed Response:"
+echo "{"
+echo "  \"queryID\": \"a1b2c3d4e5f6...\" (32 hex chars),"
+echo "  \"payloadPath\": \"/tmp/gh-awmg/tools-calls/a1b2c3d4.../payload.json\","
+echo "  \"preview\": \"{\\\"total_count\\\":1000,\\\"items\\\":[{\\\"login\\\":\\\"user1\\\"...\" (500 chars),"
+echo "  \"schema\": {"
+echo "    \"total_count\": \"number\","
+echo "    \"items\": [{"
+echo "      \"login\": \"string\","
+echo "      \"id\": \"number\","
+echo "      \"verified\": \"boolean\""
+echo "    }]"
+echo "  },"
+echo "  \"originalSize\": 234,"
+echo "  \"truncated\": false"
+echo "}"
+echo ""
+
+echo "=== Benefits ==="
+echo "✓ Reduced token usage (schema is smaller than full data)"
+echo "✓ Better understanding (see structure without verbose data)"
+echo "✓ Audit trail (complete payloads saved to disk)"
+echo "✓ Easy debugging (query IDs for tracking)"
+echo "✓ Pure Go implementation (no external jq process)"
+echo ""
+
+echo "=== Configuration ==="
+echo "- Middleware is automatically applied to all backend tools"
+echo "- System tools (sys___*) are excluded"
+echo "- Payloads stored in: /tmp/gh-awmg/tools-calls/"
+echo "- Preview truncated at 500 characters"
+echo ""
+
+echo "=== Testing ==="
+echo "Run the middleware tests:"
+echo "  make test-unit"
+echo "  go test ./internal/middleware/... -v"
+echo ""
+
+echo "Demo complete!"