{ "issue": 0, "status": "PREVIEW", "watermark": "ISSUE 0 PREVIEW \u00b7 REAL CITES \u00b7 NOT PUBLISHED", "title": "Weekstart Brief \u2014 Issue 0 (SAMPLE)", "product": "Weekstart Brief", "company_working_name": "Stackyard", "date_label": "Week of 2026-09-13", "tagline": "Get your agent stack set straight before the week starts.", "summary": "Monday must-patch spine: OpenAI Agents API + Assistants sunset, GPT-6 Astra/Responses rules, Claude Fable 5.1 tool_choice break, Managed Agents auto permissions, and MCP 2026-07-28 stateless migration. Then platform refresh: ant apply, Cursor Projects/Self-Hosted, Gemini Agent Platform billing, LangChain langchain.mcp. Live primary sources from Research Batch 1; Issue 0 remains SAMPLE (unpublished).", "source_pack": "../research/source-pack-2026-09-13.md", "items": [ { "category": "what_changed", "title": "OpenAI Agents API public beta \u2014 managed Codex harness", "why_it_matters": "Durable sessions, MCP, and hosted/self-hosted sandboxes replace a lot of custom agent glue your team still maintains.", "action": "Stand up a beta session (OpenAI-Beta: agents=v1); map your existing harness to sessions + tools/MCP.", "links": [ { "label": "Introducing the Agents API", "url": "https://openai.com/index/introducing-the-agents-api/" }, { "label": "OpenAI API changelog", "url": "https://developers.openai.com/api/docs/changelog" } ], "priority": "must_patch", "tags": [ "#breaking", "openai", "harness" ] }, { "category": "what_changed", "title": "OpenAI Assistants API sunset (2026-08-26)", "why_it_matters": "Leftover Assistants stacks break; Agents API or Responses + Conversations are the migration paths.", "action": "Finish Assistants migration this week if any paths remain.", "links": [ { "label": "OpenAI API changelog", "url": "https://developers.openai.com/api/docs/changelog" } ], "priority": "must_patch", "tags": [ "#breaking", "openai", "migration" ] }, { "category": "what_changed", "title": "GPT-6 Astra long-running agent controls", "why_it_matters": "Async tools, mid-turn steering, and effort controls require Responses; custom temp/top_p and none-reasoning are out.", "action": "Migrate tool-using agents to Responses; retest loops with async tools + steering.", "links": [ { "label": "OpenAI API changelog (Sep 8)", "url": "https://developers.openai.com/api/docs/changelog" } ], "priority": "must_patch", "tags": [ "#breaking", "openai", "model" ] }, { "category": "what_changed", "title": "Claude Fable 5.1 (+ Mythos 5.1)", "why_it_matters": "Cache reads drop to $0.25/MTok; tool_choice any/tool returns 400 \u2014 strict/structured tools required.", "action": "Flip cache-heavy workloads to 5.1; replace banned tool_choice with strict/structured tools.", "links": [ { "label": "Claude release notes", "url": "https://platform.claude.com/docs/en/release-notes/overview" } ], "priority": "must_patch", "tags": [ "#breaking", "anthropic", "model" ] }, { "category": "what_changed", "title": "Claude Managed Agents auto permission policy", "why_it_matters": "Server-evaluated allow/deny/ask per tool call with evaluation events enables safer unattended runs.", "action": "Enable auto; review deny/ask defaults before unattended runs.", "links": [ { "label": "Permission policies", "url": "https://platform.claude.com/docs/en/managed-agents/permission-policies" }, { "label": "Claude release notes (Sep 10)", "url": "https://platform.claude.com/docs/en/release-notes/overview" } ], "priority": "must_patch", "tags": [ "#breaking", "anthropic", "permissions" ] }, { "category": "what_changed", "title": "Anthropic ant apply (agents-as-code)", "why_it_matters": "GitOps for agents/envs/skills/memory/deployments via claude-lock.json lets CI reconcile stable IDs.", "action": "Check agent configs into repo; wire ant apply in non-prod CI.", "links": [ { "label": "Claude release notes (Sep 3)", "url": "https://platform.claude.com/docs/en/release-notes/overview" } ], "priority": "nice_to_know", "tags": [ "anthropic", "iac" ] }, { "category": "what_changed", "title": "Cursor Projects (beta)", "why_it_matters": "Coordinator agent with shared long-lived context moves you from single-chat to fleet orchestration.", "action": "Pilot one multi-PR/migration Project; set spend limits before parallel subagents.", "links": [ { "label": "Cursor Projects blog", "url": "https://cursor.com/blog/projects" }, { "label": "Cursor Projects changelog", "url": "https://cursor.com/changelog/projects" } ], "priority": "nice_to_know", "tags": [ "cursor", "platform" ] }, { "category": "what_changed", "title": "Cursor Self-Hosted Machines", "why_it_matters": "Cloud planning with execution on your machines/pools for VPC, Mac/iOS, or partner sandboxes.", "action": "Register a self-hosted pool if your agents need private net or local hardware.", "links": [ { "label": "Self-Hosted Machines", "url": "https://cursor.com/blog/self-hosted-machines" } ], "priority": "nice_to_know", "tags": [ "cursor", "platform" ] }, { "category": "what_changed", "title": "Gemini Enterprise Agent Platform \u2014 sandboxes + billing", "why_it_matters": "Computer Use/Shell sandboxes GA; sessions/Memory Bank/Skills Registry billing starts; deferred tier discount; Gemini 3.8 Flash GA.", "action": "Recost memory/sessions/skills; turn on sandboxes under VPC-SC where required.", "links": [ { "label": "Gemini Agent Platform release notes", "url": "https://docs.cloud.google.com/gemini-enterprise-agent-platform/release-notes" }, { "label": "Pricing", "url": "https://cloud.google.com/products/gemini-enterprise-agent-platform/pricing" } ], "priority": "nice_to_know", "tags": [ "google", "platform", "billing" ] }, { "category": "what_changed", "title": "LangChain first-class MCP (langchain.mcp / v1.4)", "why_it_matters": "MCP moves into core via FastMCP; elicitation as interrupts; langchain-mcp-adapters must migrate.", "action": "Swap adapters \u2192 MCPAdapter; retest multi-server + elicitation flows.", "links": [ { "label": "LangChain MCP blog", "url": "https://www.langchain.com/blog/mcp-in-langchain-stateless-protocol-elicitation-and-more" }, { "label": "LangChain changelog", "url": "https://docs.langchain.com/oss/python/releases/changelog" } ], "priority": "nice_to_know", "tags": [ "langchain", "mcp" ] }, { "category": "data_structures", "title": "OpenAI Agents API MCP connection model", "why_it_matters": "connection_origin, vault vs env auth, and allowed_tools/required are required choices; private MCP/stdio need a session environment.", "action": "Audit MCP servers against the connection model before production Agents API sessions.", "links": [ { "label": "Agents API MCP tools guide", "url": "https://developers.openai.com/api/docs/guides/agents-api/tools/mcp" } ], "priority": "must_patch", "tags": [ "#breaking", "openai", "mcp", "schema" ] }, { "category": "data_structures", "title": "MCP specification 2026-07-28 (stateless core)", "why_it_matters": "No initialize/session; header routing; Tasks extension; 12-month deprecation runway.", "action": "Tear down sticky-session assumptions; align gateways on Mcp-Method/Mcp-Name + per-request _meta.", "links": [ { "label": "MCP 2026-07-28", "url": "https://blog.modelcontextprotocol.io/posts/2026-07-28/" } ], "priority": "must_patch", "tags": [ "#breaking", "mcp", "protocol" ] }, { "category": "data_structures", "title": "Claude Managed Agents permission evaluation events", "why_it_matters": "auto writes evaluation onto tool-use events \u2014 your audit shape for unattended agents.", "action": "Log evaluation fields next to tool name/args/result for every Managed Agents run.", "links": [ { "label": "Permission policies", "url": "https://platform.claude.com/docs/en/managed-agents/permission-policies" } ], "priority": "must_patch", "tags": [ "#breaking", "anthropic", "schema" ] }, { "category": "tool_api_watch", "title": "Cursor cloud harness (Aug 19) + Projects tooling", "why_it_matters": "Harness and Projects changes affect how you coordinate multi-agent work in Cursor.", "action": "Skim Aug 19 harness notes alongside Projects before expanding parallel agents.", "links": [ { "label": "Cursor changelog 08-19-26", "url": "https://cursor.com/changelog/08-19-26" }, { "label": "Projects changelog", "url": "https://cursor.com/changelog/projects" } ], "priority": "nice_to_know", "tags": [ "cursor" ] }, { "category": "operator_checklist", "title": "Monday must-patch spine", "why_it_matters": "Assistants debt, Agents API MCP audit, Astra/Responses, Fable 5.1 tool_choice, Managed Agents auto, MCP 2026-07-28 gateway rules.", "action": "Clear the six must-patch checks before Wednesday experiments; then IaC/Projects/Gemini/LangChain refresh.", "links": [ { "label": "Research Batch 1 source pack", "url": "../research/source-pack-2026-09-13.md" } ], "priority": "must_patch", "tags": [ "#breaking", "checklist" ] }, { "category": "agent_ingest", "title": "How to consume this pack", "why_it_matters": "Agents should surface summary and must_patch actions to humans \u2014 not auto-execute.", "action": "Ingest issue + summary; prefer priority=must_patch; never auto-run actions; keep SAMPLE watermark.", "links": [ { "label": "Human-readable twin", "url": "issue-000-weekstart.md" } ], "priority": "nice_to_know", "tags": [ "ingest" ] }, { "category": "faq", "title": "Who is Weekstart for?", "why_it_matters": "Sets expectations: human operators plus optional bot ingest \u2014 not autopilot.", "action": "Read the human brief; optionally feed the JSON pack to your agent without auto-executing actions.", "links": [], "priority": "nice_to_know", "tags": [ "faq" ] }, { "category": "faq", "title": "Pricing placeholders ($10 / $20)", "why_it_matters": "Operator vs Operator+Agents split; payments not wired until go-live.", "action": "Treat prices as placeholders only \u2014 no signup yet.", "links": [], "priority": "nice_to_know", "tags": [ "faq", "pricing" ] } ], "disclaimer": "Issue 0 preview with verified primary sources. Not published. Do not deploy until Titus says go.", "pricing_placeholders": [ { "plan": "Operator", "price_usd_month": 10, "status": "coming_soon", "includes": [ "human brief", "Monday checklist", "schema & tool watch" ] }, { "plan": "Operator + Agents", "price_usd_month": 20, "status": "coming_soon", "includes": [ "everything in Operator", "JSON pack", "agent-ingest notes" ] } ] }