diff --git a/.gitignore b/.gitignore
index 34b24bf768..342e604478 100644
--- a/.gitignore
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e2e/rust/target/
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new file mode 100644
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diff --git a/examples/supervisor-middleware-content-guard/Cargo.toml b/examples/supervisor-middleware-content-guard/Cargo.toml
new file mode 100644
index 0000000000..eceaeac509
--- /dev/null
+++ b/examples/supervisor-middleware-content-guard/Cargo.toml
@@ -0,0 +1,24 @@
+# SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+[workspace]
+
+[package]
+name = "openshell-supervisor-middleware-content-guard"
+description = "Example OpenShell supervisor middleware service"
+version = "0.0.0"
+edition = "2024"
+rust-version = "1.90"
+license = "Apache-2.0"
+publish = false
+
+[dependencies]
+clap = { version = "4.5", features = ["derive"] }
+openshell-core = { path = "../../crates/openshell-core", default-features = false }
+prost-types = "0.14"
+tokio = { version = "1.43", features = ["macros", "rt-multi-thread"] }
+tonic = { version = "0.14", features = ["transport"] }
+
+[[bin]]
+name = "supervisor-middleware-content-guard"
+path = "src/main.rs"
diff --git a/examples/supervisor-middleware-content-guard/README.md b/examples/supervisor-middleware-content-guard/README.md
new file mode 100644
index 0000000000..8cc20c33ac
--- /dev/null
+++ b/examples/supervisor-middleware-content-guard/README.md
@@ -0,0 +1,73 @@
+
+
+# Supervisor Middleware Content Guard
+
+
+
+Supervisor middleware is a research preview. Its policy and service contracts may change without compatibility guarantees. Use it only to prototype and evaluate middleware integrations.
+
+
+
+This example implements the `example/content-guard` supervisor middleware binding. It scans UTF-8 HTTP request bodies for configured literal strings, then either replaces every match or denies the request. Findings report only aggregate counts and never include configured terms or request content.
+
+## Run the service
+
+Start the service before starting the gateway. Bind to all host interfaces so a local containerized gateway and sandbox supervisor can reach it:
+
+```shell
+cd examples/supervisor-middleware-content-guard
+cargo run -- --bind 0.0.0.0:50051
+```
+
+Add the service registration to your local gateway TOML:
+
+```toml
+[[openshell.gateway.middleware]]
+name = "content-guard-example"
+grpc_endpoint = "http://host.openshell.internal:50051"
+max_body_bytes = 262144
+```
+
+The gateway calls `Describe` during startup and fails to start if the service is unavailable. Both the gateway and sandbox supervisors must resolve and reach the configured endpoint. Change the hostname when `host.openshell.internal` is not the shared host address for your local driver.
+
+The `http://` gRPC endpoint uses plaintext without peer authentication.
+
+## Apply the example policy
+
+The included policy allows `curl` to POST to `https://httpbin.org/anything` and replaces `prototype-secret` or `internal-only` in the request body:
+
+```shell
+openshell sandbox create --policy examples/supervisor-middleware-content-guard/policy.yaml
+```
+
+From the sandbox, send a matching request:
+
+```shell
+curl -sS https://httpbin.org/anything \
+ --header 'content-type: application/json' \
+ --data '{"note":"prototype-secret"}'
+```
+
+The echoed JSON body contains `[FILTERED]` instead of the configured term.
+
+## Configuration
+
+| Field | Required | Description |
+| --- | --- | --- |
+| `mode` | No | `redact` (default) replaces matches; `deny` rejects the request. |
+| `terms` | Yes | Non-empty list of non-empty, case-sensitive literal strings. |
+| `replacement` | No | Replacement text for `redact`; defaults to `[REDACTED]` and is invalid with `deny`. |
+
+To exercise denial, change the policy config to:
+
+```yaml
+config:
+ mode: deny
+ terms:
+ - prototype-secret
+```
+
+The implementation supports only `HttpRequest/pre_credentials` and advertises a 256 KiB body limit. The gateway registration may set a smaller operator limit.
diff --git a/examples/supervisor-middleware-content-guard/policy.yaml b/examples/supervisor-middleware-content-guard/policy.yaml
new file mode 100644
index 0000000000..12da505047
--- /dev/null
+++ b/examples/supervisor-middleware-content-guard/policy.yaml
@@ -0,0 +1,32 @@
+# SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+version: 1
+
+network_middlewares:
+ - name: prototype-content-guard
+ middleware: example/content-guard
+ config:
+ mode: redact
+ terms:
+ - prototype-secret
+ - internal-only
+ replacement: "[FILTERED]"
+ on_error: fail_closed
+ endpoints:
+ include:
+ - httpbin.org
+
+network_policies:
+ httpbin:
+ name: httpbin
+ endpoints:
+ - host: httpbin.org
+ port: 443
+ protocol: rest
+ rules:
+ - allow:
+ method: POST
+ path: /anything
+ binaries:
+ - path: /usr/bin/curl
diff --git a/examples/supervisor-middleware-content-guard/src/main.rs b/examples/supervisor-middleware-content-guard/src/main.rs
new file mode 100644
index 0000000000..72120424cf
--- /dev/null
+++ b/examples/supervisor-middleware-content-guard/src/main.rs
@@ -0,0 +1,365 @@
+// SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+use std::collections::{BTreeSet, HashMap};
+use std::net::SocketAddr;
+
+use clap::Parser;
+use openshell_core::proto::middleware::v1::supervisor_middleware_server::{
+ SupervisorMiddleware, SupervisorMiddlewareServer,
+};
+use openshell_core::proto::{
+ Decision, Finding, HttpRequestEvaluation, HttpRequestResult, MiddlewareBinding,
+ MiddlewareManifest, SupervisorMiddlewareOperation, SupervisorMiddlewarePhase,
+ ValidateConfigRequest, ValidateConfigResponse,
+};
+use prost_types::Struct;
+use prost_types::value::Kind;
+use tonic::transport::Server;
+use tonic::{Request, Response, Status};
+
+const API_VERSION: &str = "openshell.middleware.v1";
+const BINDING_ID: &str = "example/content-guard";
+const OPERATION: SupervisorMiddlewareOperation = SupervisorMiddlewareOperation::HttpRequest;
+const PHASE: SupervisorMiddlewarePhase = SupervisorMiddlewarePhase::PreCredentials;
+const MAX_BODY_BYTES: u64 = 256 * 1024;
+const DEFAULT_REPLACEMENT: &str = "[REDACTED]";
+
+#[derive(Debug, Parser)]
+#[command(about = "Run the example OpenShell supervisor middleware service")]
+struct Cli {
+ /// Address on which to serve plaintext gRPC.
+ #[arg(long, default_value = "127.0.0.1:50051")]
+ bind: SocketAddr,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+enum Mode {
+ Redact,
+ Deny,
+}
+
+#[derive(Debug, PartialEq, Eq)]
+struct GuardConfig {
+ mode: Mode,
+ terms: Vec,
+ replacement: String,
+}
+
+impl GuardConfig {
+ fn parse(config: Option<&Struct>) -> Result {
+ let config = config.ok_or_else(|| "config is required".to_string())?;
+ if let Some(field) = config
+ .fields
+ .keys()
+ .find(|field| !matches!(field.as_str(), "mode" | "terms" | "replacement"))
+ {
+ return Err(format!("unsupported config field '{field}'"));
+ }
+
+ let mode = match string_field(config, "mode").unwrap_or("redact") {
+ "redact" => Mode::Redact,
+ "deny" => Mode::Deny,
+ _ => return Err("config.mode must be 'redact' or 'deny'".into()),
+ };
+
+ let terms = config
+ .fields
+ .get("terms")
+ .and_then(|value| match value.kind.as_ref() {
+ Some(Kind::ListValue(value)) => Some(&value.values),
+ _ => None,
+ })
+ .ok_or_else(|| "config.terms must be a non-empty string list".to_string())?;
+ let mut unique_terms = BTreeSet::new();
+ for term in terms {
+ let Some(Kind::StringValue(term)) = term.kind.as_ref() else {
+ return Err("config.terms must contain only strings".into());
+ };
+ if term.is_empty() {
+ return Err("config.terms cannot contain an empty string".into());
+ }
+ unique_terms.insert(term.clone());
+ }
+ if unique_terms.is_empty() {
+ return Err("config.terms must contain at least one string".into());
+ }
+
+ let replacement = string_field(config, "replacement")
+ .unwrap_or(DEFAULT_REPLACEMENT)
+ .to_string();
+ if mode == Mode::Deny && config.fields.contains_key("replacement") {
+ return Err("config.replacement is only valid in redact mode".into());
+ }
+
+ Ok(Self {
+ mode,
+ terms: unique_terms.into_iter().collect(),
+ replacement,
+ })
+ }
+}
+
+fn string_field<'a>(config: &'a Struct, name: &str) -> Option<&'a str> {
+ config
+ .fields
+ .get(name)
+ .and_then(|value| match value.kind.as_ref() {
+ Some(Kind::StringValue(value)) => Some(value.as_str()),
+ _ => None,
+ })
+}
+
+#[derive(Debug, Default)]
+struct ContentGuard;
+
+#[tonic::async_trait]
+impl SupervisorMiddleware for ContentGuard {
+ async fn describe(
+ &self,
+ _request: Request<()>,
+ ) -> Result, Status> {
+ Ok(Response::new(MiddlewareManifest {
+ api_version: API_VERSION.into(),
+ name: "example/content-guard-service".into(),
+ service_version: env!("CARGO_PKG_VERSION").into(),
+ bindings: vec![MiddlewareBinding {
+ id: BINDING_ID.into(),
+ operation: OPERATION as i32,
+ phase: PHASE as i32,
+ max_body_bytes: MAX_BODY_BYTES,
+ }],
+ }))
+ }
+
+ async fn validate_config(
+ &self,
+ request: Request,
+ ) -> Result, Status> {
+ let request = request.into_inner();
+ let validation = validate_envelope(&request.api_version, &request.binding_id, None)
+ .and_then(|()| GuardConfig::parse(request.config.as_ref()));
+ Ok(Response::new(match validation {
+ Ok(_) => ValidateConfigResponse {
+ valid: true,
+ reason: String::new(),
+ },
+ Err(reason) => ValidateConfigResponse {
+ valid: false,
+ reason,
+ },
+ }))
+ }
+
+ async fn evaluate_http_request(
+ &self,
+ request: Request,
+ ) -> Result, Status> {
+ let request = request.into_inner();
+ validate_envelope(
+ &request.api_version,
+ &request.binding_id,
+ Some(&request.phase),
+ )
+ .map_err(Status::invalid_argument)?;
+ let config =
+ GuardConfig::parse(request.config.as_ref()).map_err(Status::invalid_argument)?;
+ let body = String::from_utf8(request.body)
+ .map_err(|_| Status::invalid_argument("content guard requires a UTF-8 body"))?;
+ Ok(Response::new(evaluate(&config, &body)))
+ }
+}
+
+fn validate_envelope(
+ api_version: &str,
+ binding_id: &str,
+ phase: Option<&i32>,
+) -> Result<(), String> {
+ if api_version != API_VERSION {
+ return Err(format!("unsupported api_version '{api_version}'"));
+ }
+ if binding_id != BINDING_ID {
+ return Err(format!("unsupported binding_id '{binding_id}'"));
+ }
+ if let Some(phase) = phase
+ && *phase != PHASE as i32
+ {
+ return Err(format!("unsupported phase '{phase}'"));
+ }
+ Ok(())
+}
+
+fn evaluate(config: &GuardConfig, body: &str) -> HttpRequestResult {
+ let mut transformed = body.to_string();
+ let mut match_count = 0_u32;
+ let mut matched_term_count = 0_u32;
+ for term in &config.terms {
+ let count = u32::try_from(transformed.matches(term).count()).unwrap_or(u32::MAX);
+ if count == 0 {
+ continue;
+ }
+ match_count = match_count.saturating_add(count);
+ matched_term_count = matched_term_count.saturating_add(1);
+ if config.mode == Mode::Redact {
+ transformed = transformed.replace(term, &config.replacement);
+ }
+ }
+
+ if match_count == 0 {
+ return allow_result();
+ }
+
+ let finding = Finding {
+ r#type: "content_guard.match".into(),
+ label: "configured content matched".into(),
+ count: match_count,
+ confidence: "high".into(),
+ severity: "medium".into(),
+ };
+ let metadata = HashMap::from([
+ ("match_count".into(), match_count.to_string()),
+ ("matched_term_count".into(), matched_term_count.to_string()),
+ (
+ "mode".into(),
+ match config.mode {
+ Mode::Redact => "redact".into(),
+ Mode::Deny => "deny".into(),
+ },
+ ),
+ ]);
+
+ match config.mode {
+ Mode::Redact => HttpRequestResult {
+ decision: Decision::Allow as i32,
+ reason: String::new(),
+ body: transformed.into_bytes(),
+ has_body: true,
+ add_headers: HashMap::new(),
+ findings: vec![finding],
+ metadata,
+ },
+ Mode::Deny => HttpRequestResult {
+ decision: Decision::Deny as i32,
+ reason: "request body matched configured content".into(),
+ body: Vec::new(),
+ has_body: false,
+ add_headers: HashMap::new(),
+ findings: vec![finding],
+ metadata,
+ },
+ }
+}
+
+fn allow_result() -> HttpRequestResult {
+ HttpRequestResult {
+ decision: Decision::Allow as i32,
+ reason: String::new(),
+ body: Vec::new(),
+ has_body: false,
+ add_headers: HashMap::new(),
+ findings: Vec::new(),
+ metadata: HashMap::new(),
+ }
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box> {
+ let cli = Cli::parse();
+ println!("serving {BINDING_ID} on http://{}", cli.bind);
+ Server::builder()
+ .add_service(SupervisorMiddlewareServer::new(ContentGuard))
+ .serve(cli.bind)
+ .await?;
+ Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use prost_types::{ListValue, Value};
+ use std::collections::BTreeMap;
+
+ fn string(value: &str) -> Value {
+ Value {
+ kind: Some(Kind::StringValue(value.into())),
+ }
+ }
+
+ fn config(mode: &str, terms: &[&str], replacement: Option<&str>) -> Struct {
+ let mut fields = BTreeMap::from([
+ ("mode".into(), string(mode)),
+ (
+ "terms".into(),
+ Value {
+ kind: Some(Kind::ListValue(ListValue {
+ values: terms.iter().map(|term| string(term)).collect(),
+ })),
+ },
+ ),
+ ]);
+ if let Some(replacement) = replacement {
+ fields.insert("replacement".into(), string(replacement));
+ }
+ Struct { fields }
+ }
+
+ #[test]
+ fn redact_replaces_every_configured_match() {
+ let config = GuardConfig::parse(Some(&config(
+ "redact",
+ &["prototype-secret", "internal-only"],
+ Some("[FILTERED]"),
+ )))
+ .expect("valid config");
+ let result = evaluate(
+ &config,
+ "prototype-secret then internal-only then prototype-secret",
+ );
+
+ assert_eq!(result.decision, Decision::Allow as i32);
+ assert_eq!(
+ String::from_utf8(result.body).unwrap(),
+ "[FILTERED] then [FILTERED] then [FILTERED]"
+ );
+ assert!(result.has_body);
+ assert_eq!(result.findings[0].count, 3);
+ }
+
+ #[test]
+ fn deny_returns_a_generic_reason_without_echoing_the_term() {
+ let config = GuardConfig::parse(Some(&config("deny", &["prototype-secret"], None)))
+ .expect("valid config");
+ let result = evaluate(&config, "contains prototype-secret");
+
+ assert_eq!(result.decision, Decision::Deny as i32);
+ assert!(!result.reason.contains("prototype-secret"));
+ assert!(!result.has_body);
+ }
+
+ #[test]
+ fn no_match_allows_without_replacing_the_body() {
+ let config =
+ GuardConfig::parse(Some(&config("redact", &["blocked"], None))).expect("valid config");
+ let result = evaluate(&config, "safe content");
+
+ assert_eq!(result.decision, Decision::Allow as i32);
+ assert!(!result.has_body);
+ assert!(result.body.is_empty());
+ }
+
+ #[test]
+ fn validation_rejects_missing_terms_and_deny_replacement() {
+ let missing_terms = Struct {
+ fields: BTreeMap::from([("mode".into(), string("redact"))]),
+ };
+ assert!(GuardConfig::parse(Some(&missing_terms)).is_err());
+ assert!(
+ GuardConfig::parse(Some(&config(
+ "deny",
+ &["prototype-secret"],
+ Some("ignored")
+ )))
+ .is_err()
+ );
+ }
+}