Use mcp tools for filter chain (#621)

* agents framework demo

* more changes

* add more changes

* pending changes

* fix tests

* fix more

* rebase with main and better handle error from mcp

* add trace for filters

* add test for client error, server error and for mcp error

* update schema validate code and rename kind => type in agent_filter

* fix agent description and pre-commit

* fix tests

* add provider specific request parsing in agents chat

* fix precommit and tests

* cleanup demo

* update readme

* fix pre-commit

* refactor tracing

* fix fmt

* fix: handle MessageContent enum in responses API conversion

- Update request.rs to handle new MessageContent enum structure from main
- MessageContent can now be Text(String) or Items(Vec<InputContent>)
- Handle new InputItem variants (ItemReference, FunctionCallOutput)
- Fixes compilation error after merging latest main (#632)

* address pr feedback

* fix span

* fix build

* update openai version

crates/common/src/configuration.rs

@@ -21,8 +21,11 @@ pub struct ModelAlias {
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct Agent {
     pub id: String,
-    pub kind: Option<String>,
+    pub transport: Option<String>,
+    pub tool: Option<String>,
     pub url: String,
+    #[serde(rename = "type")]
+    pub agent_type: Option<String>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -71,6 +74,7 @@ pub struct Configuration {
     pub mode: Option<GatewayMode>,
     pub routing: Option<Routing>,
     pub agents: Option<Vec<Agent>>,
+    pub filters: Option<Vec<Agent>>,
     pub listeners: Vec<Listener>,
     pub state_storage: Option<StateStorageConfig>,
 }