Runtime Control for the MCP Layer

MCP turned every agent into a client and every tool into a target. Impart stops malicious tool use, unauthorized access, and unsanctioned MCP servers before a single tool call executes.

What it Does

MCP protection at runtime that enforces, not just observes.

Most MCP security stops at discovery dashboards or static policy. Impart evaluates and acts upon every tool call inline: who's calling, what server they're reaching, which tool they're invoking, and whether they should be.

Inspect

every MCP request in full context. The caller's identity, the server being reached, the tool being invoked, the arguments being passed, and the session history behind it.

Decide

what the call is actually trying to do. Intent gets classified against your catalog and your policy, not against a static signature list.

Enforce

unauthorized tool use stops before execution. The decision happens inline, in milliseconds. Block, modify, or allow. The behavior is yours to define.

How it Works

Catalog-aware MCP enforcement.

You can't govern what you haven't catalogued, and you can't catalog what you can't see at runtime. Impart builds the picture from live traffic on the same enforcement engine that inspects your full attack surface, then enforces against it:

Discover

every MCP server and every tool. Build a live catalog of every MCP server reaching your environment, sanctioned or not, and every tool exposed by each one.

Detect

non-conforming tool use. A caller using a tool they shouldn't. A tool invoked from a server that was never approved. A sequence of calls that fits a known abuse pattern. Detection runs on the full session, not on isolated requests.

Enforce

policy inline, before the tool runs. Rules are written against live traffic and refined continuously. Policy-as-code applies the same way to AI clients, CLI users, web apps, and direct API callers. Malicious or non-conforming calls are stopped before the tool executes downstream.

## One runtime engine
for every MCP caller.

APIexternalGET/api/v2/paymentsserviceinternalagentAI-drivenPOST/svc/auth/verify

Inline

Sits between the caller and the MCP server. Enforcement fires before the tool is invoked, not after the side effect.

device:: known fingerprint

location:: Houston TX

rate:: normal

endpoint:: /users · always

timing:: business hours

device:: new fingerprint

location:: Paris FR

rate:: 47/min

endpoint:: /pays · first

timing:: 02:14 AM

BLOCK

if request.headers.match(agent_fingerprint_db) AND request.path ~ /export|dump|bulk → block

Stateful

Full interaction history maintained across the session. Caller behavior accumulates across tools and servers, and enforcement tracks it.

Live

RULE if normalize(request.body).contains_sqli() → block

Unified

Whatever path a caller takes through your stack, the runtime knows who they are. No clean slate on pivot.

What a blocked attack looks like in Impart.

MCP attacks rarely come from a single tool call. Impart sees the sequence and stops it in real time.

Recon

A caller appears at the MCP boundary. Identity, client type, and tool-access pattern are fingerprinted at first contact. Behavioral context begins building across every surface.

Tool Enumeration

The caller starts probing the catalog — listing servers, querying tools, testing what's reachable. Velocity and access patterns are tracked against your sanctioned baseline.

Unauthorized Invocation

Intent becomes clear. The caller invokes a tool they shouldn't, on a server they were never granted, with arguments that signal exfiltration or escalation. Behavior is evaluated against full session history.

Enforcement

A rule is generated from the observed pattern, blocking the caller across MCP, API, and LLM surfaces going forward. What started as a sequence becomes a denial.

Running in production. Enforcing in real time.

"The Impart team is really innovating in the API security space. Really smart use of LLMs in their product that help security teams especially with firewall rules, which are a huge problem."

1

Travis McPeak,

CEO

"API security is now a critical aspect of every application security program. Every CISO needs to have an integrated solution that can comprehensively protect their APIs across their entire lifecycle."

2

Zane Lackey,

Co-Founder

"Great product. Great team. Makes application security so much easier and installs in minutes across both legacy and modern tech stacks."

4

Steve Hopkins,

CTO

"When we think about examples of customer love in cybersecurity, some of the most loved companies in security includes **Impart Security.**‍"

5

Ross Haleliuk,

Head of Product

"Hands down one of the best API security products on the market and the most compelling solution for serverless. Integrates with no architecture impact, and great team to work with."

7

Miguel Calles,

Engineer

"Examples like Thinkst Canary, Duo Security, Tines, Chainguard, Material, Impart, Panther, Anvilogic, and LimaCharlie show that it is possible to be pragmatic (and successful!) as a business and loved at the same time."

8

Rami McCarthy,

Security-at-Large Leader

"The team is building something truly top notch in WAF, API Security, and LLM Protection."

9

Phillip Maddux,

CEO

FAQ

How is this different from an MCP gateway or proxy?

Gateways route. Impart enforces. A gateway gives you a single ingress point; it doesn't tell you whether a given caller should be invoking a given tool, in a given sequence, with given arguments. Impart classifies intent against your catalog and policy and acts on it inline.

How do you handle MCP servers we didn't know existed?

They show up in the catalog the first time they appear in traffic. Shadow servers, experimental servers, servers a team spun up without telling security — all surface the same way as sanctioned ones. From there, you decide what's approved and what isn't.

What happens when a tool call is blocked? Does the caller see an error?

You decide. Allow, block, and modify are all valid actions. Many teams modify — sanitize the arguments, strip the unauthorized scope, return a controlled response — rather than block outright. The behavior is configurable per rule.

How does this work with agents that chain MCP tool calls together?

Enforcement fires on every call in the sequence, with full session context. If a chain is moving toward an unauthorized action, Impart stops it at the step that crosses the line — not after the chain has already completed.

## Let the attack start.
 It won’t finish.