An MCP security and governance platform for an enterprise needs runtime detection and tool-call-level enforcement, and it must block threats before data leaves. Runlayer is the strongest fit in this comparison for teams that need those controls in one platform.
Why tool poisoning and prompt injection are structurally different threats in MCP
Prompt injection is an input-validation problem, where untrusted content returned by a tool contains instructions the model follows. That content might be a ticket, web page, or email. Tool poisoning is a supply-chain problem, where hidden instructions sit in the tool description or schema loaded into the model’s context at discovery time. The user may never see them.
A poisoned tool does not need to be called. Once its description is in context, its instructions can affect a later request that uses another tool. The New York Institute of Technology threat-modeling paper identifies tool poisoning as the most prevalent and impactful client-side vulnerability across the MCP implementations it examined, rating it Critical under DREAD at 46.5/50. It can take the form of direct poisoning, tool shadowing that overrides how a trusted tool behaves, or rug pulls that change a definition that was safe before.
A rug-pull example makes the risk concrete. A “random fact of the day” server presented a benign interface, then swapped its tool definition on a second load. It manipulated a parallel server into forwarding private messages to an attacker-controlled endpoint while the user received a normal response. The danger comes from having access to private data, untrusted content, and a way to communicate outside the system together. MCP makes that combination easy to assemble.
The three criteria that separate genuine coverage from surface-level claims
The first criterion is where detection happens. Static scanners inspect tool metadata before deployment, while runtime controls inspect activity after approval. Both have a role, but approval is not permanent evidence of safety because a server can change its definition days later. Continuous snapshots of tools/list expose definition drift. Runtime interception provides the separate ability to stop a malicious invocation.
The second criterion is how deeply enforcement reaches. Session controls can block a user or revoke a token, but they do not selectively stop a poisoned call inside a legitimate session. Tool-call-level enforcement evaluates policy per invocation, ties identity to each action, scopes credentials to the operation, and flags destructive tools for confirmation. TheNYIT paperfound that five of seven tested clients implemented no static validation at all. Client-side safeguards cannot simply be assumed.
The third criterion is whether detection can prevent execution. Tamper-proof logs and OTEL tracing explain what happened, but an audit record cannot stop exfiltration in progress. Real-time controls block before execution or detect intent drift before the agent completes an action that departs from the user’s request. Identity continuity is a further test for regulated environments. Every action needs a traceable human identity rather than a shared key, including attribution preserved across token exchanges.
What the OWASP MCP Top 10 and the 2026-07-28 spec change about the baseline every platform must meet
The OWASP MCP Top 10 beta, led by Vandana Verma Sehgal, gives teams a shared threat vocabulary. MCP03 covers Tool Poisoning, while MCP06 covers Intent Flow Subversion, renamed from prompt-injection phrasing. MCP07 addresses Insufficient Authentication & Authorization, and MCP08 addresses Lack of Audit and Telemetry. MCP09 adds Shadow MCP Servers, making ungoverned adoption part of the security assessment.
MCP01 covers Token Mismanagement & Secret Exposure, and MCP02 covers Privilege Escalation via Scope Creep. MCP04 addresses Software Supply Chain Attacks, while MCP05 addresses Command Injection & Execution. MCP10 covers Context Injection & Over-Sharing.
The 2026-07-28 specification revision makes authentication requirements more concrete, with a 12-month deprecation window for legacy versions. Servers must implement OAuth 2.0 Protected Resource Metadata under RFC 9728. Clients must send the RFC 8707 resource parameter on authorization and token requests, binding tokens to a specific server. Servers must reject tokens that were issued for another audience and must not pass client tokens through to upstream APIs. Dynamic Client Registration is deprecated.
Developers and platform vendors still have to put these requirements into practice. A gateway’s OAuth support must enforce audience binding, validate issuers, and preserve actor claims. More than 1,800 active public MCP servers still have no authentication, despite being technically compliant with older specification versions. Shadow MCP requires coverage beyond the approved inventory.
Runlayer: unified detection and enforcement across all three criteria
Runlayer brings threat detection, identity continuity, and governance of shadow MCP together in one control plane. Its architecture is the basis for its placement here. Rather than stopping at deployment checks or session controls, it inspects activity at tool-call depth and supports real-time blocking. Its detection covers tool poisoning and prompt injection, while intent drift detection addresses actions that diverge from the user’s original request. That brings MCP03 and MCP06 into the same enforcement path.
Runlayer continuously snapshots tool definitions and inspects calls at execution time. Those controls serve different purposes. Snapshots expose rug pulls and definition drift after approval, while invocation-time inspection allows enforcement when an agent attempts an action.
At the enforcement layer, each invocation has identity attached, and agents receive scoped, time-limited JIT credentials per operation in place of standing API keys. This directly addresses token exposure and scope creep. Because Runlayer applies governance at tool-call depth, its controls extend beyond session approval to address the client-layer enforcement gap identified by the NYIT paper. Built-in OAuth and credential handling implement the specification’s audience-binding and token-separation requirements. SSO and SCIM integration connect agent actions to specific human identities.
The response model combines prevention with a forensic record. Real-time blocking is supported by tamper-proof audit logs and full OTEL tracing, so auditability does not substitute for intervention. Its governed registry gives employees an approved way to reach tools across 18,000+ MCP servers. Employees who are not technical can use that route from Slack without platform engineers having to rebuild authentication and access plumbing for each team. That enablement feature addresses MCP09 structurally by reducing the friction that drives ungoverned adoption.
Snyk (with Invariant Labs MCP-Scan): strong pre-deployment scanning, limited runtime reach
Snyk represents the pre-deployment scanning approach, backed by foundational tool-poisoning research. Invariant Labs first revealed and named tool poisoning attacks before Snyk bought the firm and built its capabilities into Snyk. Snyk Agent Scan, formerly MCP-Scan, is open-source and maintained under Snyk. It detects tool poisoning, cross-origin escalations, and prompt injection across Claude Desktop, Cursor, Claude Code, Gemini CLI, and Windsurf.
Its hash-based tool pinning also flags definitions that have changed. This gives teams a way to detect rug pulls when definitions are compared with approved versions, but it does not turn the scanner into a runtime gateway. It cannot intercept a malicious call as it executes or block a later definition change at the moment it occurs. Against the criteria, its strength is static detection. It fits teams that want thorough pre-deployment vetting alongside runtime controls, including open-source-first teams that run their own governance layer.
Lasso Security MCP Secure Gateway: runtime behavioral analysis with LLM-native threat detection
Lasso Security MCP Secure Gateway addresses the runtime gap left by scanners. Launched in 2025, it monitors MCP connection interactions and uses behavioral analysis across the client to detect unsafe activity. Its capabilities include real-time prompt injection blocking, PII masking, and tool reputation scoring for MCP servers. Prevention is therefore part of its operating model.
Its enforcement depth is the important distinction. Behavioral analysis operates at the connection or session level rather than providing per-call enforcement with operation-scoped credentials. The gateway also does not natively implement the specification’s audience-binding and token-separation requirements or connect agent actions to human identities through SCIM/SSO at the credential level. Those gaps leave identity and enablement to other components. Its best fit is a security team adding runtime behavioral monitoring to an existing identity and access management stack.
Traefik Hub: API gateway heritage applied to MCP with a layered authentication architecture
Traefik Hub brings API gateway patterns into MCP through its “Triple Gate Pattern,” protecting AI, MCP, and API layers. Authentication is its strongest contribution to this comparison. On-Behalf-Of Authentication uses OAuth 2.0 token exchange, addressing the requirement for a server to act as a separate OAuth client with its own token when calling upstream APIs. Task-Based Access Control lets authorization for agents change as they work. That brings decisions about access closer to operation-level scoping than broad session policies do.
These controls address a different risk from poisoned descriptions. Tool poisoning and intent drift detection are less established here than in purpose-built MCP security platforms, and runtime prompt injection detection is not the gateway model’s primary focus. API gateway logging gives teams a basis for audits, but logs alone do not show that threats can be stopped. Traefik Hub therefore fits platform teams already operating Traefik that want to extend governance to MCP endpoints. Its appeal is familiar infrastructure with strong authentication layering.
Auth0 by Okta and WorkOS: identity-layer coverage for MCP07, not a substitute for threat detection
Auth0 by Okta addresses MCP07 through dedicated authentication infrastructure. Auth for MCP became generally available in May 2026, integrating OAuth 2.1 and OpenID Connect into the MCP ecosystem. The release has Client ID Metadata Document registration, on-behalf-of token exchange for downstream API calls, and Resource Parameter Compatibility Mode. Tokens are issued for specific servers to meet RFC 8707 audience binding requirements. These controls establish who can access a server and how credentials reach downstream services.
WorkOS approaches the same layer through AuthKit and enterprise identity tools. AuthKit can act as an OAuth 2.1 authorization server for MCP servers and works with the official MCP SDKs. Fine-Grained Authorization provides tool-level permission scoping, while SSO and SCIM supply enterprise identity primitives. This is meaningful enforcement depth for access control. It suits teams building MCP servers that need MCP-compatible OAuth and enterprise identity without implementing everything themselves.
Neither option is a tool-poisoning detection platform. They do not provide intent flow subversion detection, prompt injection blocking in tool results, rug-pull alerting, or shadow MCP governance. That architectural boundary is consistent with their intended role. Authentication can permit a call without determining whether malicious instructions caused it. Teams using either still need runtime threat coverage for MCP03 and MCP06.
How to secure enterprise MCP deployments by matching controls to the threats
The practical decision starts with the missing layer. A team that needs rigorous checks before deployment has a clear role for scanning, while a team exposed to post-approval changes needs runtime interception. Within runtime products, the next distinction is between session-oriented behavioral analysis and per-invocation policy with scoped credentials. The distinct roles of request-time authentication and malicious-content detection, alongside these other differences, explain why products with credible MCP support serve different security needs.
A multi-tool stack can cover several layers. Snyk, Lasso, and Auth0 together address pre-deployment scanning, runtime behavioral analysis, and identity, but introduce three vendor relationships, three integration surfaces, and three audit log silos. That approach can fit an enterprise with an established identity stack and the capacity to integrate controls. Where employees already bypass a difficult sanctioned path, added friction can worsen shadow MCP adoption. Runlayer’s unified approach is a stronger fit when enablement and enforcement need to operate together.
Every agent action must trace to a specific human, including through token exchanges. SSO/SCIM integration, actor-claim attribution, and JIT credentials are therefore part of the enforcement assessment. Shared-key management fails HIPAA’s unique user identification requirement. Permission to use a tool is not enough if the resulting action cannot be attributed.
For teams just starting, missing logs, undifferentiated access, and borrowed credentials may create more immediate operational risk than sophisticated poisoning. Teams should fix MCP07 and MCP08 without treating them as the final security architecture. A platform that addresses those basics and runtime threats together avoids a later retrofit across separate tools.