Facio Blog

Practical notes on human-reviewed AI agents.

Payload-powered product notes, security writing, HITL patterns, and operational guidance from the Facio runtime: long sessions, Placet approvals, audit trails, memory, providers, channels, tools, and Docker-first operations.

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Showing 21-25 of 62 articles in Engineering.

Engineering

MCP Spotlight: Sentry MCP Server — The Error Tracking Bridge With Seer AI Autofix, Issue Sync to GitHub/Linear/Jira, and the Production-Observability Default for Agents

Jul 1, 2026Engineering

MCP Spotlight: Sentry MCP Server — The Error Tracking Bridge With Seer AI Autofix, Issue Sync to GitHub/Linear/Jira, and the Production-Observability Default for Agents

The official Sentry MCP Server — ~22 tools (issues, events, releases, performance, replays, source maps, Seer AI root-cause analysis, issue sync to Linear/Jira/GitHub). MIT-licensed, GA, official Sentry-maintained. The production-observability default for AI agents in 2026.

Engineering

MCP Spotlight: Resend MCP Server — The React-Email-Native Transactional Email Bridge, Full Audience Management, and the Communication Default for Agents

Jun 30, 2026Engineering

MCP Spotlight: Resend MCP Server — The React-Email-Native Transactional Email Bridge, Full Audience Management, and the Communication Default for Agents

The Resend MCP Server — the email-agent default of 2026. ~20 tools (emails, audiences, broadcasts, domains, webhooks, deliverability analytics), native React Email template support (JSX compiles at send-time), MIT-licensed. Built on the infrastructure Anthropic, Linear, and Vercel use.

Engineering

MCP Spotlight: Sequential Thinking MCP Server — Anthropic's Reference Implementation for Structured, Branchable, Revisable Reasoning

Jun 29, 2026Engineering

MCP Spotlight: Sequential Thinking MCP Server — Anthropic's Reference Implementation for Structured, Branchable, Revisable Reasoning

Anthropic's Sequential Thinking MCP Server — the reference implementation for structured agent reasoning. One tool (sequential_thinking), MIT-licensed, with three superpowers: revision (correct earlier thoughts), branching (explore alternatives in parallel), and expansion (adapt the scope mid-stream). The meta-tool pattern that improves every other tool the agent uses.

Engineering

MCP Spotlight: Anthropic Filesystem MCP Server — Sandboxed Read/Write, Allow-Listed Directories, and the Reference Architecture for File Access

Jun 28, 2026Engineering

MCP Spotlight: Anthropic Filesystem MCP Server — Sandboxed Read/Write, Allow-Listed Directories, and the Reference Architecture for File Access

The Anthropic Filesystem MCP Server is the reference implementation for safe file access in the MCP ecosystem — ~14 tools (read, write, edit, search, move, delete), MIT-licensed, with strict --allowed-directory sandbox + symlink resolution at the boundary. The architectural template every local-resource MCP server should copy.

Engineering

MCP Spotlight: Postgres MCP Pro — Configurable Read/Write Access, Schema-Aware Index Tuning & the Safety Pattern Every Database MCP Needs

Jun 27, 2026Engineering

MCP Spotlight: Postgres MCP Pro — Configurable Read/Write Access, Schema-Aware Index Tuning & the Safety Pattern Every Database MCP Needs

Postgres MCP Pro by Crystal DBA — configurable read/write access at the database role level, schema-aware index tuning, migration generation with safety checks, EXPLAIN plan visibility, MIT-licensed. The defense-in-depth pattern every database MCP server should copy.