bug: fix json schema

README.md

@@ -30,6 +30,7 @@ The server is a bridge between the Telegram API and the AI assistants and is bas
 - [Configuration](#configuration)
   - [Authorization](#authorization)
   - [Client Configuration](#client-configuration)
+  - [JSON Schema Version](#json-schema-version)
 - [Star History](#star-history)
 
 ## What is MCP?
@@ -263,6 +264,16 @@ Example of Configuring Claude Desktop to recognize the Telegram MCP server.
     }
     ```
 
+### JSON Schema Version
+
+Some MCP clients (e.g. VS Code) do not support JSON Schema Draft 2020-12 and will reject tools that use it. You can override the JSON Schema version by setting the `--schema-version` flag or the `TG_SCHEMA_VERSION` environment variable.
+
+Common values:
+| Version | URL |
+|---------|-----|
+| Draft-07 (recommended for VS Code) | `https://json-schema.org/draft-07/schema#` |
+| Draft 2020-12 (default) | `https://json-schema.org/draft/2020-12/schema` |
+
 ## Star History
 
 <a href="https://www.star-history.com/#chaindead/telegram-mcp&Date">

go.mod

@@ -4,6 +4,7 @@ go 1.24
 
 require (
 	github.com/gotd/td v0.121.0
+	github.com/invopop/jsonschema v0.12.0
 	github.com/metoro-io/mcp-golang v0.8.0
 	github.com/pkg/errors v0.9.1
 	github.com/rs/zerolog v1.34.0
@@ -28,7 +29,6 @@ require (
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/gotd/ige v0.2.2 // indirect
 	github.com/gotd/neo v0.1.5 // indirect
-	github.com/invopop/jsonschema v0.12.0 // indirect
 	github.com/klauspost/compress v1.18.0 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mattn/go-colorable v0.1.14 // indirect

main.go

@@ -59,6 +59,11 @@ func main() {
 				Value:   sesionPath,
 				Sources: cli.EnvVars("TG_SESSION_PATH"),
 			},
+			&cli.StringFlag{
+				Name:    "schema-version",
+				Usage:   "JSON Schema version URL (e.g. https://json-schema.org/draft-07/schema#)",
+				Sources: cli.EnvVars("TG_SCHEMA_VERSION"),
+			},
 			&cli.BoolFlag{
 				Name:        "dry",
 				Usage:       "Test configuration",

serve.go

@@ -7,6 +7,7 @@ import (
 	"os"
 
 	"github.com/chaindead/telegram-mcp/internal/tg"
+	"github.com/invopop/jsonschema"
 
 	mcp "github.com/metoro-io/mcp-golang"
 	"github.com/metoro-io/mcp-golang/transport/stdio"
@@ -20,6 +21,10 @@ func serve(ctx context.Context, cmd *cli.Command) error {
 	sessionPath := cmd.String("session")
 	dryRun := cmd.Bool("dry")
 
+	if schemaURL := cmd.String("schema-version"); schemaURL != "" {
+		jsonschema.Version = schemaURL
+	}
+
 	_, err := os.Stat(sessionPath)
 	if err != nil {
 		return fmt.Errorf("session file not found(%s): %w", sessionPath, err)