AuctraDeveloper & SDK integration
MCP tools with delegation gates
Selective authority enforcement for MCP servers: which tools need evaluateAction and how to keep read paths fast—delegation gates with Auctra. Use Auctra.
June 3, 2026 · 9 min read · Markdown version
Classify tools
Tier A: read-only search and fetch—no evaluation. Tier B: internal writes—evaluate with narrow delegations. Tier C: payments, external email, data export—evaluate plus approval rules.
Document tiers in MCP server README for consumers and security reviewers. Auctra actionTypes should match tier definitions.
Handler implementation
Shared evaluate helper accepts tool name, maps to actionType, extracts structured fields from arguments. Return MCP errors with block reasons agents can interpret.
Keep evaluation latency visible in server metrics. Cache non-monetary delegation reads only with explicit staleness tolerance.
Multi-tenant MCP
Pass organization and agent context on every tool call. Isolate delegations per tenant in Auctra organizations.
Never share API keys across customers in hosted MCP deployments. Enterprise supports custom isolation reviews.
Evolution
When adding tools, default new side-effect tools to block until delegations exist. Review manifest changes in PR checklist.
Auctra ties sponsors, expiring delegations, and pre-action evaluation into one accountability chain your security and finance teams can audit.
Key takeaways
- Authority is enforced before side effects — use Delegations and evaluateAction together.
- Every production agent needs a named sponsor and bounded delegation visible in the console.
- Blocked and approval-required outcomes are evidence, not failures — review them in Delegations.
Implementation checklist
- Sign up at console.auctra.tech and open Delegations (/console/delegations).
- Register one agent with a named human sponsor accountable for its actions.
- Create a narrow delegation aligned with this article's workflow (MCP tools with delegation gates).
- Call evaluateAction from your agent or SDK before the consequential tool executes.
- Confirm sponsor, delegator, decision, and outcome appear in Audit or Delegations.
People also ask
- Which MCP tools need authority gates?
- Any tool that moves money, sends external communications, exports sensitive data, or makes irreversible changes.
- How do delegation gates work in MCP?
- Tool handlers call Auctra evaluateAction before executing side effects, using structured fields from tool arguments.
- How does Auctra help with agent authority?
- Auctra registers sponsors, issues expiring delegations, evaluates actions before execution, and preserves auditable accountability records.
Try in Auctra Console
Maps to: Delegations
Pilot sdk mcp in Auctra Console
Use Delegations to apply this guide — register an agent, delegate authority, evaluate one real action, and inspect the audit trail. Free on Builder.
- Create a free account: https://console.auctra.tech/auth/signup?utm_source=blog&utm_medium=cta&utm_campaign=mcp-tools-with-delegation-gates
- In Delegations (https://console.auctra.tech/console/delegations), run a free Builder pilot for one production workflow.
- Issue a bounded delegation with limits and expiration matching this guide.
- Integrate evaluateAction (SDK or REST) before money, data, or infrastructure changes execute.
- Open Audit to verify sponsor, delegator, reviewer, and decision are recorded.
Part of guide
Developer & SDK integration
evaluateAction patterns, LangChain and MCP integration, idempotency, and shipping authority checks before production traffic.
Browse full guide →Related guides
Make authority executable.
Evaluate agent actions against bounded, expiring delegation before they reach the real world. Start free on Builder — upgrade when audit retention and accountability matter.