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[MCP] Add support for resources (#5239)

Browse Source 
This PR adds support for [MCP
resources](https://modelcontextprotocol.io/specification/2025-06-18/server/resources)
by adding three new tools for the model:
1. `list_resources`
2. `list_resource_templates`
3. `read_resource`

These 3 tools correspond to the [three primary MCP resource protocol
messages](https://modelcontextprotocol.io/specification/2025-06-18/server/resources#protocol-messages).

Example of listing and reading a GitHub resource tempalte
<img width="2984" height="804" alt="CleanShot 2025-10-15 at 17 31 10"
src="https://github.com/user-attachments/assets/89b7f215-2e2a-41c5-90dd-b932ac84a585"
/>

`/mcp` with Figma configured
<img width="2984" height="442" alt="CleanShot 2025-10-15 at 18 29 35"
src="https://github.com/user-attachments/assets/a7578080-2ed2-4c59-b9b4-d8461f90d8ee"
/>

Fixes #4956
This commit is contained in:
Gabriel Peal
2025-10-16 22:05:15 -07:00
committed by GitHub
parent bdda762deb
commit 40fba1bb4c
18 changed files with 1705 additions and 24 deletions
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240
codex-rs/core/src/mcp_connection_manager.rs
View File

@@ -22,6 +22,14 @@ use codex_rmcp_client::OAuthCredentialsStoreMode;
use codex_rmcp_client::RmcpClient;
use mcp_types::ClientCapabilities;
use mcp_types::Implementation;
use mcp_types::ListResourceTemplatesRequestParams;
use mcp_types::ListResourceTemplatesResult;
use mcp_types::ListResourcesRequestParams;
use mcp_types::ListResourcesResult;
use mcp_types::ReadResourceRequestParams;
use mcp_types::ReadResourceResult;
use mcp_types::Resource;
use mcp_types::ResourceTemplate;
use mcp_types::Tool;
use serde_json::json;
@@ -164,6 +172,47 @@ impl McpClientAdapter {
}
}
async fn list_resources(
&self,
params: Option<mcp_types::ListResourcesRequestParams>,
timeout: Option<Duration>,
) -> Result<mcp_types::ListResourcesResult> {
match self {
McpClientAdapter::Legacy(_) => Ok(ListResourcesResult {
next_cursor: None,
resources: Vec::new(),
}),
McpClientAdapter::Rmcp(client) => client.list_resources(params, timeout).await,
}
}
async fn read_resource(
&self,
params: mcp_types::ReadResourceRequestParams,
timeout: Option<Duration>,
) -> Result<mcp_types::ReadResourceResult> {
match self {
McpClientAdapter::Legacy(_) => Err(anyhow!(
"resources/read is not supported by legacy MCP clients"
)),
McpClientAdapter::Rmcp(client) => client.read_resource(params, timeout).await,
}
}
async fn list_resource_templates(
&self,
params: Option<mcp_types::ListResourceTemplatesRequestParams>,
timeout: Option<Duration>,
) -> Result<mcp_types::ListResourceTemplatesResult> {
match self {
McpClientAdapter::Legacy(_) => Ok(ListResourceTemplatesResult {
next_cursor: None,
resource_templates: Vec::new(),
}),
McpClientAdapter::Rmcp(client) => client.list_resource_templates(params, timeout).await,
}
}
async fn call_tool(
&self,
name: String,
@@ -349,7 +398,7 @@ impl McpConnectionManager {
Ok((Self { clients, tools }, errors))
}
/// Returns a single map that contains **all** tools. Each key is the
/// Returns a single map that contains all tools. Each key is the
/// fully-qualified name for the tool.
pub fn list_all_tools(&self) -> HashMap<String, Tool> {
self.tools
@@ -358,6 +407,133 @@ impl McpConnectionManager {
.collect()
}
/// Returns a single map that contains all resources. Each key is the
/// server name and the value is a vector of resources.
pub async fn list_all_resources(&self) -> HashMap<String, Vec<Resource>> {
let mut join_set = JoinSet::new();
for (server_name, managed_client) in &self.clients {
let server_name_cloned = server_name.clone();
let client_clone = managed_client.client.clone();
let timeout = managed_client.tool_timeout;
join_set.spawn(async move {
let mut collected: Vec<Resource> = Vec::new();
let mut cursor: Option<String> = None;
loop {
let params = cursor.as_ref().map(|next| ListResourcesRequestParams {
cursor: Some(next.clone()),
});
let response = match client_clone.list_resources(params, timeout).await {
Ok(result) => result,
Err(err) => return (server_name_cloned, Err(err)),
};
collected.extend(response.resources);
match response.next_cursor {
Some(next) => {
if cursor.as_ref() == Some(&next) {
return (
server_name_cloned,
Err(anyhow!("resources/list returned duplicate cursor")),
);
}
cursor = Some(next);
}
None => return (server_name_cloned, Ok(collected)),
}
}
});
}
let mut aggregated: HashMap<String, Vec<Resource>> = HashMap::new();
while let Some(join_res) = join_set.join_next().await {
match join_res {
Ok((server_name, Ok(resources))) => {
aggregated.insert(server_name, resources);
}
Ok((server_name, Err(err))) => {
warn!("Failed to list resources for MCP server '{server_name}': {err:#}");
}
Err(err) => {
warn!("Task panic when listing resources for MCP server: {err:#}");
}
}
}
aggregated
}
/// Returns a single map that contains all resource templates. Each key is the
/// server name and the value is a vector of resource templates.
pub async fn list_all_resource_templates(&self) -> HashMap<String, Vec<ResourceTemplate>> {
let mut join_set = JoinSet::new();
for (server_name, managed_client) in &self.clients {
let server_name_cloned = server_name.clone();
let client_clone = managed_client.client.clone();
let timeout = managed_client.tool_timeout;
join_set.spawn(async move {
let mut collected: Vec<ResourceTemplate> = Vec::new();
let mut cursor: Option<String> = None;
loop {
let params = cursor
.as_ref()
.map(|next| ListResourceTemplatesRequestParams {
cursor: Some(next.clone()),
});
let response = match client_clone.list_resource_templates(params, timeout).await
{
Ok(result) => result,
Err(err) => return (server_name_cloned, Err(err)),
};
collected.extend(response.resource_templates);
match response.next_cursor {
Some(next) => {
if cursor.as_ref() == Some(&next) {
return (
server_name_cloned,
Err(anyhow!(
"resources/templates/list returned duplicate cursor"
)),
);
}
cursor = Some(next);
}
None => return (server_name_cloned, Ok(collected)),
}
}
});
}
let mut aggregated: HashMap<String, Vec<ResourceTemplate>> = HashMap::new();
while let Some(join_res) = join_set.join_next().await {
match join_res {
Ok((server_name, Ok(templates))) => {
aggregated.insert(server_name, templates);
}
Ok((server_name, Err(err))) => {
warn!(
"Failed to list resource templates for MCP server '{server_name}': {err:#}"
);
}
Err(err) => {
warn!("Task panic when listing resource templates for MCP server: {err:#}");
}
}
}
aggregated
}
/// Invoke the tool indicated by the (server, tool) pair.
pub async fn call_tool(
&self,
@@ -369,7 +545,7 @@ impl McpConnectionManager {
.clients
.get(server)
.ok_or_else(|| anyhow!("unknown MCP server '{server}'"))?;
let client = managed.client.clone();
let client = &managed.client;
let timeout = managed.tool_timeout;
client
@@ -378,6 +554,64 @@ impl McpConnectionManager {
.with_context(|| format!("tool call failed for `{server}/{tool}`"))
}
/// List resources from the specified server.
pub async fn list_resources(
&self,
server: &str,
params: Option<ListResourcesRequestParams>,
) -> Result<ListResourcesResult> {
let managed = self
.clients
.get(server)
.ok_or_else(|| anyhow!("unknown MCP server '{server}'"))?;
let client = managed.client.clone();
let timeout = managed.tool_timeout;
client
.list_resources(params, timeout)
.await
.with_context(|| format!("resources/list failed for `{server}`"))
}
/// List resource templates from the specified server.
pub async fn list_resource_templates(
&self,
server: &str,
params: Option<ListResourceTemplatesRequestParams>,
) -> Result<ListResourceTemplatesResult> {
let managed = self
.clients
.get(server)
.ok_or_else(|| anyhow!("unknown MCP server '{server}'"))?;
let client = managed.client.clone();
let timeout = managed.tool_timeout;
client
.list_resource_templates(params, timeout)
.await
.with_context(|| format!("resources/templates/list failed for `{server}`"))
}
/// Read a resource from the specified server.
pub async fn read_resource(
&self,
server: &str,
params: ReadResourceRequestParams,
) -> Result<ReadResourceResult> {
let managed = self
.clients
.get(server)
.ok_or_else(|| anyhow!("unknown MCP server '{server}'"))?;
let client = managed.client.clone();
let timeout = managed.tool_timeout;
let uri = params.uri.clone();
client
.read_resource(params, timeout)
.await
.with_context(|| format!("resources/read failed for `{server}` ({uri})"))
}
pub fn parse_tool_name(&self, tool_name: &str) -> Option<(String, String)> {
self.tools
.get(tool_name)
@@ -413,7 +647,7 @@ fn resolve_bearer_token(
}
/// Query every server for its available tools and return a single map that
/// contains **all** tools. Each key is the fully-qualified name for the tool.
/// contains all tools. Each key is the fully-qualified name for the tool.
async fn list_all_tools(clients: &HashMap<String, ManagedClient>) -> Result<Vec<ToolInfo>> {
let mut join_set = JoinSet::new();