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RUNTIME AUTHORIZATION PLATFORM FOR APPS, APIS, AND AGENTS

Aegis vs. Permit.io

Name: Aegis
Brand: Aegis

Permit.io is a policy-as-code authorization engine that governs humans, services, and AI agents through a Policy Decision Point and MCP Gateway. Aegis is a human-facing card for one person’s agents.

Permit.io is an adjacent alternative, not necessarily a direct substitute for Aegis. Aegis is an early-stage concept with no cryptographic signing, encryption, or immutable logging implemented.

Core use case

AEGIS

An individual wants to write, in their own words, what an agent may do, then approve, block, pause, or revoke that authority without touching a policy language.

PERMIT.IO

A platform team wants to replace scattered permission checks with a centralized policy engine (RBAC/ABAC/ReBAC) that agents, services, and users all evaluate against — including per-tool-call checks on MCP traffic.

Side-by-side

Dimension	Aegis	Permit.io
Policy model	Free-text task + fixed fields (data, actions, mode, limit)	Formal policy as code (RBAC, ABAC, ReBAC), with a no-code editor option
Subjects governed	One person’s individual agents	Humans, services, and agents under one unified model
Decision point	None — approvals are simulated in the browser	A real Policy Decision Point (PDP), deployable in the customer’s own network
MCP support	Not applicable — no live agent connection	Dedicated MCP Gateway enforcing policy on every tool call
Audit	Local action ledger, browser-only	Comprehensive audit logging with decision traces
Pricing approach	Free concept; no plans, seats, or billing.	Pricing is disclosed on request via Permit.io’s site; no public flat rate is listed there.
Free option	Fully free, local demo.	Permit.io’s site does not clearly state a self-serve free tier — check their current pricing page before assuming one.
Speed to first value	Minutes — describe a task, pick a mode, done.	Longer runway — requires modeling a policy schema and integrating the PDP or gateway into your stack.
Accuracy / precision	Boundaries are as precise as the sentence you write; there is no policy engine validating edge cases.	Formal policy evaluation (RBAC/ABAC/ReBAC) built to hold up against adversarial or ambiguous access requests, including prompt-injection-aware checks on agent tool calls.
Ease of use	No-code, designed for one person, not a team.	Built for platform and security engineers; more powerful, more setup.

Pros & cons

Aegis — strengths

+Immediate, human-readable authority definition
+No policy language to learn
+Pause-all and revoke are always one click away

Aegis — limits

–No actual policy engine — nothing is programmatically enforced
–Not built for multi-agent or multi-tenant environments
–No integration path into a real product today

Permit.io — strengths

+Unified authorization model across humans, services, and agents
+Purpose-built MCP Gateway for agent tool-call governance
+Enterprise customers already running it at scale (per Permit.io’s site)

Permit.io — limits

–Requires engineering investment to model policies correctly
–Not something a non-technical individual would set up alone
–Public pricing detail is limited on the marketing site

Verdict

Permit.io is infrastructure for teams that need enforceable, centralized policy across humans, services, and agents — including live MCP tool-call governance. Aegis is a much simpler, human-facing sketch of what visible consent for one person’s agent could feel like. Treat them as adjacent, not competing: a team could plausibly use Permit.io underneath and something like Aegis’s card UI in front of it.

FAQ

Does Aegis use a policy engine like Permit.io’s PDP?

No. Aegis has no Policy Decision Point. Approvals and blocks in the current build are simulated in the browser for demonstration.

Is Permit.io meant for individual consumers?

No — it’s built for engineering and platform teams securing applications, APIs, and agents at the infrastructure level, not for an individual configuring their own personal agent.

Which one enforces MCP tool-call restrictions today?

Permit.io, via its MCP Gateway. Aegis does not connect to a live MCP server or agent in its current build.

Other comparisons

Aegis vs. Auth0 for AI Agents Aegis vs. Cerbos Aegis vs. Descope All comparisons

Sourced from Permit.io’s official site (https://www.permit.io) as of research time. Verify current features and pricing directly with Permit.io before making a decision.