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use std::collections::VecDeque;
use anyhow::Context;
use codex_connectors::AppToolPolicyEvaluator;
use codex_connectors::AppToolPolicyInput;
use codex_protocol::ThreadId;
use codex_protocol::items::McpToolCallStatus;
use codex_protocol::items::TurnItem;
use codex_protocol::mcp::McpResourceOrigin;
use codex_protocol::mcp::McpResourceOriginCheckpoint;
use codex_protocol::protocol::EventMsg;
use rmcp::model::ReadResourceRequestParams;
use rmcp::model::ReadResourceResult;
use crate::CODEX_APPS_MCP_SERVER_NAME;
use crate::McpBinding;
const MAX_ORIGINS: usize = 64;
const MAX_ORIGIN_BYTES: usize = 1024;
#[derive(Default)]
pub(crate) struct ResourceOrigins {
origins: VecDeque<ResourceOrigin>,
turns: VecDeque<String>,
current_turn_id: Option<String>,
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub(crate) struct ResourceOrigin {
call_id: String,
turn_id: Option<String>,
tool: String,
connector_id: String,
link_id: Option<String>,
uri: String,
ambiguous_account: bool,
}
impl ResourceOrigins {
pub(crate) fn checkpoint(&self) -> Option<McpResourceOriginCheckpoint> {
(!self.origins.is_empty()).then(|| McpResourceOriginCheckpoint {
origins: self
.origins
.iter()
.map(|origin| McpResourceOrigin {
call_id: origin.call_id.clone(),
turn_id: origin.turn_id.clone(),
tool: origin.tool.clone(),
connector_id: origin.connector_id.clone(),
link_id: origin.link_id.clone(),
uri: origin.uri.clone(),
ambiguous_account: origin.ambiguous_account,
})
.collect(),
turns: self.turns.iter().cloned().collect(),
current_turn_id: self.current_turn_id.clone(),
})
}
pub(crate) fn restore_checkpoint(&mut self, checkpoint: &McpResourceOriginCheckpoint) {
if checkpoint.origins.len() > MAX_ORIGINS
|| checkpoint.turns.len() > MAX_ORIGINS
|| checkpoint
.turns
.iter()
.any(|turn_id| turn_id.len() > MAX_ORIGIN_BYTES)
|| checkpoint
.current_turn_id
.as_ref()
.is_some_and(|turn_id| turn_id.len() > MAX_ORIGIN_BYTES)
{
*self = Self::default();
return;
}
let origins = checkpoint
.origins
.iter()
.map(|origin| ResourceOrigin {
call_id: origin.call_id.clone(),
turn_id: origin.turn_id.clone(),
tool: origin.tool.clone(),
connector_id: origin.connector_id.clone(),
link_id: origin.link_id.clone(),
uri: origin.uri.clone(),
ambiguous_account: origin.ambiguous_account,
})
.collect::<VecDeque<_>>();
if origins.iter().any(|origin| {
origin.byte_len() > MAX_ORIGIN_BYTES || origin.connector_id.trim().is_empty()
}) {
*self = Self::default();
return;
}
*self = Self {
origins,
turns: checkpoint.turns.iter().cloned().collect(),
current_turn_id: checkpoint.current_turn_id.clone(),
};
}
pub(crate) fn observe(&mut self, event: &EventMsg) {
match event {
EventMsg::TurnStarted(event) if event.turn_id.len() <= MAX_ORIGIN_BYTES => {
self.current_turn_id = Some(event.turn_id.clone());
if self.turns.back() != Some(&event.turn_id) {
self.turns.push_back(event.turn_id.clone());
if self.turns.len() > MAX_ORIGINS {
self.turns.pop_front();
}
}
}
EventMsg::ItemCompleted(event) => {
let TurnItem::McpToolCall(item) = &event.item else {
return;
};
if item.status == McpToolCallStatus::Completed {
self.remember(
&item.id,
Some(&event.turn_id),
&item.server,
&item.tool,
&item.arguments,
item.connector_id.as_deref(),
item.link_id.as_deref(),
item.mcp_app_resource_uri.as_deref(),
);
}
}
EventMsg::McpToolCallEnd(event)
if event
.result
.as_ref()
.is_ok_and(|result| !result.is_error.unwrap_or(false)) =>
{
let turn_id = self.current_turn_id.clone();
self.remember(
&event.call_id,
turn_id.as_deref(),
&event.invocation.server,
&event.invocation.tool,
event
.invocation
.arguments
.as_ref()
.unwrap_or(&serde_json::Value::Null),
event.connector_id.as_deref(),
event.link_id.as_deref(),
event.mcp_app_resource_uri.as_deref(),
);
}
EventMsg::ThreadRolledBack(event) => {
for _ in 0..event.num_turns {
let Some(turn_id) = self.turns.pop_back() else {
*self = Self::default();
return;
};
self.origins.retain(|origin| {
origin.turn_id.is_some()
&& origin.turn_id.as_deref() != Some(turn_id.as_str())
});
}
self.current_turn_id = self.turns.back().cloned();
}
_ => {}
}
}
pub(crate) fn find(&self, call_id: &str) -> anyhow::Result<ResourceOrigin> {
self.origins
.iter()
.rev()
.find(|origin| origin.call_id == call_id)
.cloned()
.context("originating MCP tool call was not found or did not complete successfully")
}
#[expect(
clippy::too_many_arguments,
reason = "only bounded provenance fields are retained"
)]
fn remember(
&mut self,
call_id: &str,
turn_id: Option<&str>,
server: &str,
tool: &str,
arguments: &serde_json::Value,
connector_id: Option<&str>,
link_id: Option<&str>,
uri: Option<&str>,
) {
if server != CODEX_APPS_MCP_SERVER_NAME {
return;
}
let Some(connector_id) = connector_id.filter(|value| !value.trim().is_empty()) else {
return;
};
let Some(uri) = uri else {
return;
};
let link_id = link_id.filter(|value| !value.trim().is_empty());
let ambiguous_account = arguments
.get("link_id")
.and_then(serde_json::Value::as_str)
.filter(|value| !value.trim().is_empty())
.is_some_and(|argument_link_id| Some(argument_link_id) != link_id);
let origin = ResourceOrigin {
call_id: call_id.to_owned(),
turn_id: turn_id.map(str::to_owned),
tool: tool.to_owned(),
connector_id: connector_id.to_owned(),
link_id: link_id.map(str::to_owned),
uri: uri.to_owned(),
ambiguous_account,
};
if origin.byte_len() > MAX_ORIGIN_BYTES {
return;
}
if let Some(index) = self
.origins
.iter()
.position(|existing| existing.call_id == origin.call_id)
{
self.origins.remove(index);
}
if self.origins.len() >= MAX_ORIGINS {
self.origins.pop_front();
}
self.origins.push_back(origin);
}
}
impl ResourceOrigin {
fn byte_len(&self) -> usize {
self.call_id.len()
+ self.turn_id.as_ref().map_or(0, String::len)
+ self.tool.len()
+ self.connector_id.len()
+ self.link_id.as_ref().map_or(0, String::len)
+ self.uri.len()
}
pub(crate) async fn read(
&self,
binding: &McpBinding,
thread_id: ThreadId,
uri: &str,
) -> anyhow::Result<ReadResourceResult> {
if self.uri != uri {
anyhow::bail!("originating MCP tool call does not match the requested resource");
}
if self.ambiguous_account {
anyhow::bail!("originating MCP tool call has ambiguous account selection");
}
let tool_info = binding
.tool_info(CODEX_APPS_MCP_SERVER_NAME, &self.tool)
.context("originating MCP tool is unavailable")?;
if tool_info.connector_id.as_deref() != Some(self.connector_id.as_str()) {
anyhow::bail!("originating MCP tool connector does not match its app context");
}
let tool_meta = tool_info.tool.meta.as_ref().map(|meta| &meta.0);
let current_link_id = tool_meta
.and_then(|meta| meta.get("link_id"))
.and_then(serde_json::Value::as_str)
.filter(|value| !value.trim().is_empty());
if current_link_id != self.link_id.as_deref() {
anyhow::bail!("originating MCP tool link does not match its app context");
}
if self.link_id.is_none()
&& tool_meta
.and_then(|meta| meta.get("_codex_apps"))
.and_then(|meta| meta.get("requires_explicit_link_id"))
.and_then(serde_json::Value::as_bool)
== Some(true)
{
anyhow::bail!("originating MCP tool requires an explicit account link");
}
let annotations = tool_info.tool.annotations.as_ref();
if !AppToolPolicyEvaluator::new(&binding.config().config_layer_stack)
.policy(AppToolPolicyInput {
connector_id: Some(&self.connector_id),
link_id: None,
tool_name: tool_info.tool.name.as_ref(),
tool_title: tool_info.tool.title.as_deref(),
destructive_hint: annotations.and_then(|value| value.destructive_hint),
open_world_hint: annotations.and_then(|value| value.open_world_hint),
})
.enabled
{
anyhow::bail!("originating MCP tool is disabled by app configuration");
}
let meta = serde_json::from_value(serde_json::json!({
"threadId": thread_id,
"x-codex-turn-metadata": {
"mcp_request_meta": {
"selected_connector_ids": [&self.connector_id],
"link_id": &self.link_id,
}
},
}))?;
binding
.read_resource(
CODEX_APPS_MCP_SERVER_NAME,
ReadResourceRequestParams::new(uri).with_meta(meta),
)
.await
}
}
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