How DriftGuard compares
Contract drift on vendor APIs and MCP tool catalogs — what you get from manual checks, one-off JSON diff, and a dedicated watchtower.
This table is for engineering and platform buyers evaluating monitoring approaches. It is not a competitive matrix against IaC or infrastructure drift tools — DriftGuard focuses on external contracts your agents and services depend on.
Capability comparison
| Capability | Manual monitoring | Raw JSON diff | DriftGuard |
|---|---|---|---|
| Continuous scheduled checks | Rare — depends on humans | Only if you build cron + storage | Hosted watches on plan intervals |
MCP tools/list monitoring |
Manual spot checks | Custom scripts per server | Native MCP watch type — tool removal = breaking |
| Breaking vs warning semantics | Subjective review | Depends on diff library | Unified diff-core — CLI, MCP, API agree |
agentAction remediation hints |
Runbooks in Notion | Not included | Structured hints on every change |
| Offline local diff (no signup) | N/A | Ad-hoc scripts | OSS compare_json + MCP |
| CI coverage gate | Policy docs only | Custom assert logic | assert_coverage + GitHub Action |
| Orchestrator preflight gate | Not available | Build yourself | POST /api/preflight + MCP status tools |
| Alert routing (Slack, PagerDuty, webhooks) | Manual paging | Wire your own | Per-watch policies + webhook v2 |
| Policy-gated block on drift | Process only | Not included | Drift policies — ack, block runs, draft PR |
| Remediation packages | Manual PRs | Manual PRs | SchemaSync, MockDrift, ToolChange, FuseGuard |
| Fleet / portfolio status | Spreadsheets | Per-repo scripts | Console + portfolio API |
When manual monitoring is enough
- One or two stable vendor APIs with infrequent changes
- No production AI agents on MCP tool catalogs
- Team already subscribes to vendor changelog emails and acts on them
When raw JSON diff is enough
- Pre-deploy fixture comparison in CI only — no runtime catalog drift
- You own both sides of the contract (internal APIs)
- No need for alerts, incidents, or agent-oriented remediation
When DriftGuard fits
- Production agents call third-party MCP servers or REST APIs you do not control
- Tool removal or schema tightening causes retry spirals or silent failures
- You need CI coverage plus continuous monitoring plus orchestrator gates