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Reintegrate mcp security guards into agentgateway #1

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Merged
APuzik-devpulse merged 3 commits into from
Feb 10, 2026
Merged

Reintegrate mcp security guards into agentgateway #1

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366f4f6
Reintegrate mcp security guards into agentgateway
APuzik-devpulse Feb 10, 2026
2471649
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APuzik-devpulse Feb 10, 2026
12d6ddc
Fix: wait while initialization is done.
APuzik-devpulse Feb 10, 2026
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482 changes: 449 additions & 33 deletions crates/agentgateway/src/mcp/handler.rs
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2 changes: 2 additions & 0 deletions crates/agentgateway/src/mcp/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,8 @@ pub enum Error {
ForwardLegacySse(String),
#[error("failed to create SSE url: {0}")]
CreateSseUrl(String),
#[error("security guard rejected: {1} - {2}")]
SecurityGuard(RequestId, String, String),
}

impl From<Error> for ProxyError {
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11 changes: 11 additions & 0 deletions crates/agentgateway/src/mcp/router.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -105,10 +105,16 @@ impl App {
.collect::<Result<Vec<_>, _>>()?;

McpBackendGroup {
name: format!(
"{}/{}",
backend_group_name.namespace, backend_group_name.name
),
targets: nt,
stateful: backend.stateful,
security_guards: backend.security_guards.clone(),
}
};
let guard_registry = self.state.guard_registry.clone();
let sm = self.session.clone();
let client = PolicyClient { inputs: pi.clone() };
let authorization_policies = backend_policies
Expand Down Expand Up @@ -178,12 +184,14 @@ impl App {
match (req.uri().path(), req.method(), authn) {
("/sse", _, _) => {
// Assume this is streamable HTTP otherwise
let guard_registry_clone = guard_registry.clone();
let sse = LegacySSEService::new(
move || {
Relay::new(
backends.clone(),
authorization_policies.clone(),
client.clone(),
guard_registry_clone.clone(),
)
.map_err(|e| Error::new(e.to_string()))
},
Expand Down Expand Up @@ -226,6 +234,7 @@ impl App {
backends.clone(),
authorization_policies.clone(),
client.clone(),
guard_registry.clone(),
)
.map_err(|e| Error::new(e.to_string()))
},
Expand All @@ -247,8 +256,10 @@ impl App {

#[derive(Debug, Clone)]
pub struct McpBackendGroup {
pub name: String,
pub targets: Vec<Arc<McpTarget>>,
pub stateful: bool,
pub security_guards: Vec<crate::mcp::security::McpSecurityGuard>,
}

#[derive(Debug)]
Expand Down
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