Agentseal
Open-source CLI to red-team AI prompts and audit MCP servers
AgentSeal is the most thorough open-source agent security scanner we've tested. Its runtime MCP verification and cross-artifact detection are unique—no other tool actually executes server code to prove vulnerabilities. If your team lives in the terminal and takes agent security seriously, this is a strong pick. Expect a CLI learning curve; the dashboard is minimal.
Verified 2d ago · liveness 82/100 · cite: rightaichoice.com/tools/agentseal
- Security engineers red-teaming AI agent system prompts and MCP servers
- Developers using coding agents (Cursor, Claude Code) who need to check for poisoned skill files
- DevOps teams integrating agent security into CI/CD pipelines with policy-as-code
- Researchers studying prompt injection, MCP vulnerabilities, and agent attack surfaces
- Non-technical users who need a GUI-only tool or step-by-step wizard
- Teams seeking managed commercial support without self-hosting or paying $149/mo Enterprise
- Users wanting a production-ready dashboard without initial setup effort
We scan live Reddit threads, YouTube comments, X posts, G2 reviews and other communities — and hand you an honest verdict in under a minute.
- Honest verdict, not marketing
- Real pros & cons from real users
- Attributed quotes with receipts
3 free scans · no card needed
Skip AgentSeal if you need a GUI-first, zero-configuration security tool or if you're not comfortable with a CLI and setting up model providers.
Free tier only includes 225 basic probes; to run the full 311-probe suite (including MCP, RAG, and multimodal attacks), you need the $49/mo Pro tier.
AgentSeal's pricing fits security-focused individuals and small teams who want deep MCP auditing without SaaS lock-in. At $49/mo Pro, it's cheaper than Lakera or Prompt Security (typically $200+/mo) and offers runtime verification they lack. Enterprise at $149/mo is for teams needing priority support.
In short
Agentseal — Open-source CLI to red-team AI prompts and audit MCP servers. Best for Security engineers red-teaming AI agent system prompts and MCP servers, Developers using coding agents (Cursor, Claude Code) who need to check for poisoned skill files, DevOps teams integrating agent security into CI/CD pipelines with policy-as-code. Free to start; paid plans from $49/mo.
What's new in Agentseal
Checked 2 days agoAcross the latest 4 updates: 4 news mentions.
From Static Findings to Working Exploits: Runtime Validation of 6 High-Profile MCP Servers
Controlled lab testing of 6 MCP servers (68K+ GitHub stars) confirmed all flagged vulnerabilities via runtime exploits.
555 MCP Servers Have Toxic Data Flows. Here's What We Found.
Analysis of 5,125 MCP servers reveals 935 dangerous tool combination paths across 555 servers, with runtime probes.
We Scanned 1,808 MCP Servers. 66% Had Security Findings.
Registry data from a year of MCP breaches shows 66% of scanned servers have security findings; defense matters.
We Scanned 50 Cursor Rules Files From GitHub. 6 Had Hidden Instructions.
Zero-width Unicode, base64 payloads, and toxic data flows turn AI coding agents into attack vectors.
What people actually say about Agentseal — is it worth it?
We ran a structured research pass across product reviews, community discussions, and post-purchase forum threads to surface the patterns vendors won't publish themselves. Below: the recurring strengths, the hidden costs people mention most, and the cohort that consistently regrets adopting this tool.
20 mentions across 2 sources (Hacker News, Product Hunt) · researched Jul 3, 2026.
- +Fully open-source and free with no enterprise contracts required.
- +Covers multiple attack surfaces: prompts, MCP servers, skill files.
- +380+ attack probes for comprehensive vulnerability detection.
- +Deterministic probes with unique canaries for reproducible CI results.
- +CI/CD integration with GitHub Actions, SARIF, and JUnit.
- −Very limited community adoption—hard to gauge real-world effectiveness.
- −Prompt scanning requires paid API access to an LLM provider.
- −No plug-and-play cloud version—must run CLI or integrate yourself.
- −Dashboard is basic and lacks advanced reporting features.
- −MCP registry accuracy not independently verified.
Viability Score
How well maintained and how widely used is Agentseal? Built from what the vendor actually publishes (docs, changelog, tutorials, integrations, pricing), whether the site is live, and how much real users discuss it. How we calculate this
Last calculated: September 2026
How we score →Key Features
- 380+ adversarial probes (extraction, injection, multimodal, behavioral)
- Runtime MCP scanning in sandbox (local, Docker, remote HTTP)
- Cross-artifact toxic flow detection (skill + MCP compound attacks)
- Guard: 6-stage pipeline scanning 14 skill file formats
- Watch: real-time file monitoring with quarantine and desktop notifications
- Auto-discovers 27 agent configurations (Cursor, Claude Code, Windsurf, Continue)
- CI/CD integration: GitHub Actions, SARIF 2.1.0, JUnit, policy-as-code
- BYOK: supports 12 LLM providers (Ollama, OpenAI, Claude, Gemini, DeepSeek, etc.)
- Deterministic probes with unique canaries for reproducible CI results
- Offline mode with local Ollama models, zero telemetry
- 15 analyzers for command execution, credential exfiltration, base64 payloads, Unicode tag attacks
- MCP Registry: 9,100+ servers analyzed via 7-stage security pipeline
- Base prompt scans (191 probes), MCP tools (45 probes), RAG (28 probes), multimodal (13 probes), behavioral genome (105)
- PDF and JSON report export
- Dashboard with encrypted sync (AES-256 Fernet)
About Agentseal
AgentSeal is an open-source command-line toolkit that hardens AI agents by probing every layer of the attack surface: system prompts, MCP servers, skill files, and local machines. It runs 311 adversarial probes covering extraction, injection, multimodal, behavioral, and RAG attacks, plus a dedicated 225-probe suite in the free tier. The tool audits MCP servers through runtime sandbox testing, scans skill files for hidden instructions, and monitors systems in real time for configuration drift. Built for developers, security teams, and DevOps, it drops into CI/CD pipelines with GitHub Actions, SARIF, and JUnit support—no API keys needed for machine-level scans. The free tier unlocks 225 basic probes, Guard, Watch, and the MCP Registry of 9,100+ analyzed servers. Pro ($49/mo) adds all 311 probes, runtime MCP scanning with OAuth, PDF export, and the dashboard; Enterprise ($149/mo) includes priority support. A key differentiator is BYOK: prompts go directly to your LLM provider, never to AgentSeal's servers, with offline mode for local Ollama models and zero telemetry. Recent registry scans show 66% of MCP servers have security findings, and runtime validation of six high-profile servers confirmed every flagged vulnerability was exploitable. Compare this to SaaS options like Lakera or Prompt Security: AgentSeal offers a local-first, CLI-driven workflow with deeper MCP auditing and no lock-in, at the cost of a steeper setup and a less polished dashboard.
Behind the Verdict
AgentSeal stands out in the crowded AI security space by focusing on the entire attack surface rather than just prompt injection. The 311-probe suite is grounded in published research (MPMA, MINJA, TAMAS, HashJack, OWASP Agentic Top 10), and the deterministic approach means results are reproducible—perfect for CI. The MCP Registry is a differentiator: with 9,100+ servers analyzed through a 7-stage pipeline, you get evidence-based trust scores before installing a server. The 2026 blog posts show the registry's real-world value: 66% of scanned servers have security findings, and runtime validation of six high-profile servers confirmed every flagged vulnerability was exploitable. For teams using coding agents like Cursor or Claude Code, Guard's ability to detect poisoned skill files (including zero-width Unicode tricks) is a practical, immediate benefit. Where AgentSeal falls short is usability: the CLI is powerful but steep, and the dashboard is minimal. Non-technical stakeholders will struggle. Pricing is reasonable: the free tier is generous, and Pro at $49/mo unlocks the full attack surface. For teams that need a GUI-first, managed solution, Lakera or Prompt Security might be easier, but they lack the local-first, BYOK model that keeps your prompts private. If you're a security engineer who lives in the terminal, AgentSeal is a must-have. If you're looking for a plug-and-play enterprise tool, look elsewhere.
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Real-world workflow fit
Concrete scenarios for the personas Agentseal actually fits — and what changes day-one when you adopt it.
You've just installed AgentSeal. You run 'agentseal scan' against your system prompt and get a trust score with findings. You then run 'agentseal scan-mcp' on a new MCP server before integrating it.
Outcome: Within minutes, you have a clear trust score and list of vulnerabilities, enabling you to fix issues before deployment.
You integrate AgentSeal into your GitHub Actions CI pipeline, using the SARIF output to block PRs with critical findings.
Outcome: Your CI now automatically catches prompt injection, MCP poisoning, and skill file issues, ensuring secure agent deployments.
You're using Cursor with custom rules. You run 'agentseal guard' to scan your machine for poisoned skill files.
Outcome: AgentSeal detects hidden instructions in .cursorrules files, protecting your coding agent from manipulation.
Use Cases
- Scan your system prompt for extraction and injection vulnerabilities before deployment.
- Audit a live MCP server for tool poisoning before integrating it into your agent.
- Monitor your machine for changes to agent skill files and MCP configs in real time.
- Integrate agent security checks into your CI pipeline using GitHub Actions and SARIF output.
- Discover toxic data flows that combine skill files and MCP servers into compound attacks.
- Browse the MCP Registry to find pre-audited servers with known security scores.
- Validate MCP server claims with runtime exploits, as demonstrated in recent blog posts.
- Protect coding agents (Cursor, Claude Code) from poisoned skill files.
Models Under the Hood
as of 2026-09-01
Limitations
- Prompt red-teaming and scanning require model access via a configured provider (API key) and are not available offline, while guard machine scanning can run locally without keys.
- Scanning coverage is limited to attacks detectable via probe suites and semantic analysis; zero-day or novel attack vectors may not be caught.
as of 2026-08-31
Verification history
We have re-verified Agentseal 5 times since . Each pass re-reads the vendor's own pages and re-checks every listed field against that evidence; passes where nothing had changed are marked as such.
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
Free to cite with attribution — this page re-verifies continuously.
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published Agentseal tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Free
$0/mo
Ideal for
Security enthusiasts and small teams wanting to test AgentSeal without commitment, using 225 basic probes and machine scanning.
What this tier adds
Starting tier: includes 225 basic probes, Guard, Watch, and MCP Registry access, but no runtime MCP scanning or dashboard.
Pro
$49/mo
Ideal for
Professional security engineers and DevOps teams needing full 311-probe coverage, runtime MCP scanning, and dashboard for CI integration.
What this tier adds
Adds all 380 probes (including MCP, RAG, multimodal), runtime MCP scanning with OAuth, PDF export, and dashboard access.
Enterprise
$149/mo
Ideal for
Organizations requiring priority support and unlimited usage for large-scale agent security programs.
What this tier adds
Adds priority support and unlimited usage on top of all Pro features.
Where the pricing makes sense
The company stage and team size where Agentseal's pricing actually pencils out — and where peers do it cheaper.
AgentSeal's pricing fits security-focused individuals and small teams who want deep MCP auditing without SaaS lock-in. At $49/mo Pro, it's cheaper than Lakera or Prompt Security (typically $200+/mo) and offers runtime verification they lack. Enterprise at $149/mo is for teams needing priority support.
Setup time & first value
How long it actually takes to get something useful out of Agentseal — broken out by persona, not the marketing-page minute.
For security engineers familiar with CLI, you can install with pip or npm and run 'scan' within 5 minutes. Setting up Guard and Watch takes about 10 minutes. Integrating into CI/CD takes about 30 minutes.
Switching to or from Agentseal
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From Lakera or Prompt Security: Export your system prompts and run AgentSeal's scan to get a baseline; use BYOK so prompts stay with your provider.
- →From manual prompt testing: Create a test suite using AgentSeal's CI/CD integration to automate regression testing.
- ↗To Lakera or Prompt Security: Since AgentSeal exports JSON and PDF reports, you can use those to document vulnerabilities and transition to a managed SaaS.
- ↗To a commercial MCP audit service: Use AgentSeal's runtime validation reports to compare findings before switching.
Integrations
Resources & Guides
- Documentationagentseal.org
Docs · Agentseal
Full product docs from agentseal.org
- Quickstartagentseal.org
Installation · Agentseal
Get up and running fast from agentseal.org
- Quickstartagentseal.org
Quick Start · Agentseal
Get up and running fast from agentseal.org
- Documentationagentseal.org
Scan Types · Agentseal
Full product docs from agentseal.org
- Documentationagentseal.org
Mcp Registry · Agentseal
Full product docs from agentseal.org
- Documentationagentseal.org
Ci Cd Integration · Agentseal
Full product docs from agentseal.org
- Documentationagentseal.org
Cli Reference · Agentseal
Full product docs from agentseal.org
- Resourceagentseal.org
Blog · Agentseal
Helpful link from agentseal.org
Tutorials & Learning
Official links
Tools that pair well with Agentseal
Common stack mates teams adopt alongside Agentseal, with the specific reason each pairing earns its keep.
Featured Head-to-Head Comparisons
Agentseal vs Audioeye
If you're securing AI agents against prompt injection and MCP attacks, AgentSeal is a free, open-source powerhouse with evidence of real-world exploitation. If you need web accessibility compliance to avoid ADA lawsuits, AudioEye provides an enterprise-grade automated plus human-audit solution. These tools serve completely different use cases — choose based on your threat model.
Agentseal vs Temporal Ai
AgentSeal and Temporal AI solve fundamentally different problems: AgentSeal secures AI agent deployments against prompt injection and MCP attacks, while Temporal AI ensures agents execute reliably with durable workflows. If your priority is shipping safe agents, start with AgentSeal's free scanner; if you need to orchestrate fault-tolerant multi-step agents, choose Temporal. They can be complementary: use Temporal for execution reliability and AgentSeal for security audits.
Agentseal vs Push Security
Choose AgentSeal if you're a developer or security engineer needing open-source, code-level scanning for AI agent configurations, MCP servers, and prompt injection. Choose Push Security if you're an enterprise security team needing browser-based detection and control over phishing, AI tool usage, and identity attacks — it's cloud-based and covers a broader threat landscape. Both are free to start but serve very different attack surfaces.
Alternatives to Agentseal
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