Security• MCP Alternatives Guide

Best Alternatives to Agent Custody

Looking for an alternative to Agent Custody? Whether you need a different runtime environment, custom authentication support, or alternative API integrations in the Security ecosystem, we have cataloged and compared the top alternative MCP servers below.

Browse all Security servers →View Agent Custody Specs →

Target Reference Server

Agent Custody Overview

The agent-custody MCP server checks agent tool calls against signed delegation grants and Cedar policy before forwarding them. It can mediate MCP servers, REST APIs exposed as tools, and other agents reached over A2A, while recording signed receipts and Merkle log proofs. Use it when tool calls affect production, money, personal data, or require independent audit evidence. Its optional state package adds governed memory with provenance, rollback, retention, and certified deletion.

Primary Use Cases for Agent Custody:

Enforce signed authorization for production tool calls
Create audit evidence for agent actions
Verify receipts outside the producing system
Trace beliefs and actions after a bad memory write

Specification Matrix: Agent Custody vs Alternatives

Direct comparison of key metrics, runtimes, authentication methods, and community popularity.

Server Name	Runtime	Auth	Pricing	GitHub Stars	Downloads	Action
Agent Custody (Target)	—	—	Free	8	—	Current
Delego	uvx	No auth required	Free	25	—	Compare →
Emilia Protocol	npx	No auth required	Free	612	—	Compare →
Scopeblind Gateway	npx	No auth required	Free	10	—	Compare →
EthersFlow — Trust Gate for AI Agents	npx	—	—	2	—	Compare →
Platform	npx	API key	Free	15	—	Compare →
Trustscoreagent	npx	No auth required	Free	—	—	Compare →
Vorim MCP Server	npx	API key	Free	66	—	Compare →
Cordon	npx	—	—	1	—	Compare →
Gatekeeper	npx	—	—	—	—	Compare →
Haldir	uvx	API key	Freemium	4	—	Compare →
MCP Bastion	npx	—	—	7	—	Compare →
Aegis	uvx	No auth required	Free	18	—	Compare →

Detailed Evaluation of Agent Custody Alternatives

Delego

Runtime: uvxSecurity

Authorizes agent actions with deterministic policy checks, human approval, single-use bindings, and a signed audit chain.

Key Features:

Deterministic action policy evaluation

Human approval outside MCP

Intent and fingerprint binding

2 0 25

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Emilia Protocol

Runtime: npxSecurity

Requires named human approval for consequential agent actions and issues verifiable Ed25519 trust receipts.

Key Features:

Named human approval gates

Ed25519 Trust Receipts

Offline receipt verification

5 0 612

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Scopeblind Gateway

Runtime: npxSecurity

A security gateway proxy for MCP servers with per-tool policies, approval gates, and optional Ed25519-signed receipts.

Key Features:

Per-tool policy enforcement (block, rate limit, min tier)

Shadow mode logs all tool calls without blocking

Enforce mode applies policies to tool calls

2 0 10

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EthersFlow — Trust Gate for AI Agents

Runtime: npxSecurity

Verifies agent actions before execution with policy checks, adversarial model review, and signed Ed25519 verdicts.

Key Features:

Pre-execution action verification

Deterministic policy fast path

Adversarial multi-model consensus

1 0 2

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Platform

Runtime: npxSecurity

Govern MCP tool calls with policy checks, human approvals, and tamper-evident audit traces.

Key Features:

MCP governance proxy

Policy-based allow, deny, and approval decisions

Human review workflows

5 0 15

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Trustscoreagent

Runtime: npxSecurity

Checks service reputation, submits ratings, and discovers rated APIs through a free MCP-connected trust registry.

Key Features:

Pre-call service reputation checks

Post-call rating submission

Service discovery with sorting and filtering

2 0

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Vorim MCP Server

Runtime: npxSecurity

Manage AI agent identity, permissions, delegated credentials, trust scores, and signed audit records through Vorim AI.

Key Features:

Ed25519 agent identity registration

Ephemeral did:key agents with TTL

Scoped permissions and rate limits

2 0 66

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Cordon

Runtime: npxSecurity

Routes MCP tool calls through configurable policies, audit logs, and terminal or Slack approval workflows.

Key Features:

Per-server and per-tool policy enforcement

Structured JSON audit logging

Terminal and Slack approval workflows

1 0 1

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Gatekeeper

Runtime: npxSecurity

Routes MCP tool calls through policy checks, approvals, budgets, and append-only audit logging.

Key Features:

Policy-based allow, deny, and approval decisions

Sensitive-boundary rule pack

USD, token, and call budgets

1 0

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Haldir

Runtime: uvxSecurity

Governance layer for AI agents with scoped sessions, encrypted secrets, audit trails, approvals, and MCP call interception.

Key Features:

Scoped agent sessions

AES-256-GCM encrypted secret vault

Hash-chained audit trail

3 0 4

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MCP Bastion

Runtime: npxSecurity

Proxies MCP servers with automatic recovery, namespaced tools, runtime security controls, and optional compliance audit logging.

Key Features:

Automatic health checks and reconnects

Agent-accessible connection recovery

Namespaced multi-server tool aggregation

1 0 7

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Aegis

Runtime: uvxSecurity

Governs AI agent and MCP tool calls with YAML policies, approvals, risk checks, guardrails, and tamper-evident audit logs.

Key Features:

YAML policy rules with approval gates

MCP stdio and HTTP transport proxy

Prompt-injection, PII, leak, and toxicity checks

4 0 18

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Frequently Asked Questions: Agent Custody Alternatives

The top-rated alternatives to Agent Custody in the Security category include Delego, Emilia Protocol, Scopeblind Gateway. These servers offer complementary or alternative capabilities depending on your deployment stack and authentication requirements.

Agent Custody and its alternatives vary by runtime requirement (Node.js/npx, Python/uvx, Docker, or remote HTTP/SSE endpoints). Check the specification comparison table above to verify command requirements before installing.

It varies by server. Pricing, auth and license are declared by each maintainer and shown in the comparison table where provided — a dash means nothing was declared, so check that project's own site before assuming it's free.

Click the "Compare side-by-side →" button on any alternative card to see an in-depth comparison matrix covering feature lists, stars, npm downloads, install configurations, and schema specifications.