Snyk MCP server: 13 tools inside the Snyk CLI

A security scanner exposed as tools, why authentication is itself a tool, and what the server reports back to Snyk about your agent.

Last verified 1 September 2026 · from The Snyk CLI repository, npm and the server's own tools/list response

This page is one of 90 in a directory of monitoring and developer tools. Each page checks what an AI coding agent can get out of the tool through its MCP server, the connector that lets the agent query the tool directly.

What is the Snyk MCP server?

It is Snyk's server for the Model Context Protocol. Snyk scans code and dependencies for vulnerabilities, so a connected agent can check its own output before proposing it.

The scanning surface is broad for thirteen tools: static analysis of source, open-source dependency scanning, container images and infrastructure-as-code files. It also covers an existing SBOM, the software bill of materials for a project, and an AI bill of materials for Python projects.

Two tools are about the session rather than about scanning. snyk_auth authenticates, snyk_logout clears the stored token, and snyk_trust marks a folder as safe for the scanner to read.

It is strongest in code, tests and review, touches CI and release through container and infrastructure scanning, and reaches nothing in production, agent observability or cost.

For an agent, Snyk answers whether something is safe to ship. It can scan the file it just wrote, the image built from it and the Terraform beside it. It cannot tell you what the deployed service is doing, so it belongs beside a telemetry connector rather than instead of one.

What can an AI agent do with Snyk?

snyk_trust is the gate in front of everything else. Its own description says it should be run only when the user instructs it, because it grants the scanner access to a folder.

What connecting costs before the first question

A context window is the amount of text a model can hold at once, and connecting uses some of it before the agent asks anything. Every tool the server registers sends its name, description and input schema to the model when the session starts. The tool list is charged whether or not a single tool is called.

13 tools cost between 5,531 and 9,667 tokens, about 2.8% to 4.8% of a 200,000-token window.

Schemas carry most of it. Descriptions average 432 characters and schemas average 1,405, because a scan tool has to describe every option the CLI accepts.

Encodings: GPT-5.6, GPT-5.5 o200k_base; GPT-4, GPT-3.5 cl100k_base; Claude Haiku 4.5 to Opus 5 count_tokens. Counted 24 August 2026 from tools/list on the released CLI 1.1306.4. It was started with snyk mcp -t stdio locally.

Registration is static, so no Snyk account was involved. Figures cover name, description and input schema.

The two models in column one share the o200k_base encoding, so they get one count. The spread is formatting, about 21%. Reasoning tokens are output, spent per request. The tool list is input, charged once at connection.

The Claude figures are measured rather than encoded. Anthropic publishes no local tokenizer. So the definitions were sent to the API's count_tokens endpoint, and a no-tools baseline was subtracted. The range covers two tokenizer generations rather than two serializations. Haiku 4.5 and Opus 4.6 sit at the low end. Opus 5 and Sonnet 5 sit at the high end. The gap between them is about a third.

Snyk MCP server limits: where answers come back incomplete

The limits below follow from the server living inside a CLI that has its own session and its own trust list.

How to configure Snyk MCP for agents

1. 1

   Authenticate before connecting if you can

   An existing CLI session avoids the agent calling snyk_auth mid-conversation, which opens an authentication flow the agent cannot complete alone.

2. 2

   Understand snyk_trust

   It marks a folder as safe to scan, and its own description asks the model to run it only when instructed.

3. 3

   Decide about snyk_send_feedback

   It reports the change in issue counts from a run back to Snyk, including a count of issues the model prevented.

4. 4

   Use absolute paths

   The dependency scan's description asks for one in capital letters, which is a strong hint that relative paths cause failures.

Paste this into your agent’s instructions

Scan results look authoritative and their scope is invisible in the answer. The block makes the agent name the path and the scan type.

When you answer using Snyk MCP tools, state:
- The absolute path or image you scanned, and which scan you
  ran. Code, dependency, container and IaC scans differ.
- Whether the folder was already trusted, or whether you
  called snyk_trust to make it so.
- Whether you called snyk_auth, snyk_logout or
  snyk_send_feedback. These change session or send data.
Never state that data does not exist. State that the scan
above returned no findings.
Write your answer in ASD-STE100 Simplified Technical
English. Use short sentences with one idea in each.

Do you need the MCP server at all?

Not for a pipeline scan. Snyk's own CLI is the direct alternative. Running snyk test in a terminal produces the same findings without spending context.

The connector earns its place inside the loop. An agent that can scan the file it just wrote, before proposing it, is doing something a separate terminal step does not.

At 5,531 tokens the standing cost is small, so the decision is about trust and reporting rather than about context.

Connect it when the agent writes code. Use the CLI directly for scheduled or pipeline scanning.

Snyk MCP server setup

There is no separate package to install. The Snyk CLI is the server, and snyk mcp -t stdio is the whole command.

Authentication reuses the CLI's stored token, so a machine where snyk auth has already run needs no credential in the configuration file.

claude mcp add-json "snyk" '{"command":"npx",
  "args":["-y","snyk","mcp","-t","stdio"]}'

{"mcpServers":{"snyk":{"command":"npx",
  "args":["-y","snyk","mcp","-t","stdio"]}}}

[mcp_servers.snyk]
command = "npx"
args = ["-y", "snyk", "mcp", "-t", "stdio"]

Every other client

Each block below is the configuration for one client, with the file path and the key that client expects.

{"mcpServers":{"snyk":{"command":"npx",
  "args":["-y","snyk","mcp","-t","stdio"]}}}

{"mcpServers":{"snyk":{"command":"npx",
  "args":["-y","snyk","mcp","-t","stdio"]}}}

{"servers":{"snyk":{"command":"npx",
  "args":["-y","snyk","mcp","-t","stdio"]}}}

{"mcpServers":{"snyk":{"command":"npx",
  "args":["-y","snyk","mcp","-t","stdio"]}}}

{"mcpServers":{"snyk":{"command":"snyk",
  "args":["mcp","-t","stdio"]}}}

Read-only access, permissions and security

• snyk_trust widens what can be read

  It marks a folder as safe for the scanner, and its description tells the model to run it only when instructed.

• Two tools change the session

  snyk_auth authenticates the machine and snyk_logout clears the locally stored token, which affects the CLI outside the agent as well.

• One tool sends data to Snyk

  snyk_send_feedback reports the change in issue counts for a run, including a count of vulnerabilities the model prevented in new code.

• Scans run locally

  That keeps source on your machine, and it also means the agent can point a scan at any path the trust list allows.

Troubleshooting

A scan reports that you are not authenticated

Run snyk auth in a terminal, or let the agent call snyk_auth, which exists for exactly this case. The token is stored by the CLI, not by the agent.

A dependency scan fails on a valid project

The tool's description asks for an absolute path in capital letters. A relative path is the usual cause.

The scanner refuses to read a folder

The folder is not trusted. snyk_trust grants access, and its own description asks that it be run only on instruction.

An SBOM scan finds nothing in a real SBOM

Snyk matches a component only when it carries a PackageURL identifier. An SBOM without those identifiers scans clean regardless of what it lists.

Snyk MCP server: Reference

What engineers report

The Snyk CLI repository carries 5,644 stars, 699 forks and 100 or more releases since 30 October 2015. The signals worth reading here concern the MCP mode rather than the CLI.

Repository facts from the GitHub API and npm, retrieved 24 August 2026. GitHub reports the license as unrecognized; the LICENSE file itself states Apache-2.0. Tool counts and sizes come from the CLI's own tools/list response.

Should you connect an agent to Snyk?

Yes. Best for a machine where snyk auth has already run, so the agent never has to start an authentication flow.

Strongest fit

Teams whose agents write code and who want it scanned in the same loop rather than in a later pipeline stage.

Main advantage

Scans run locally through a CLI most teams already have, so nothing new is deployed.

Main weakness

No view of running systems, so a vulnerability's real exposure has to be established elsewhere.

Operational risk

snyk_trust widens scanner access and snyk_send_feedback reports run outcomes to Snyk, both enabled by default.

Frequently asked questions