Claude Code 2.1.191 Lets /rewind Reach Back Past a /clear
Claude Code v2.1.191 (June 24, 2026) extends /rewind so you can restore conversation and code state from before you ran /clear, recovering context that used to be gone for good.
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Fix: MCP error -32000: Connection closed in Claude Code
MCP error -32000 means your MCP server process exited before the handshake finished. Fix the missing binary, the Windows cmd /c wrap, the event-loop exit, and the startup race.
Fix: FOREIGN KEY constraint failed when deleting an entity in EF Core 11
EF Core throws FOREIGN KEY constraint failed because the parent still has dependents the database refuses to orphan. Load the children, make the relationship optional, or configure OnDelete.
Fix: No service for type 'Microsoft.EntityFrameworkCore.DbContextOptions' has been registered
EF Core throws this when AddDbContext never ran, ran after Build, or your context's constructor takes the wrong DbContextOptions. Register before Build and use DbContextOptions<YourContext>.
JWT vs cookie authentication in ASP.NET Core 11: which should you pick?
Use cookie authentication for any app where the browser is the only client, and reserve JWT bearer tokens for APIs called by mobile apps, other services, or third parties. Here is the full decision matrix.
Claude Code 2.1.187 Stops the Sandbox From Reading Your AWS Keys
The new sandbox.credentials setting in Claude Code v2.1.187 denies reads of credential files and unsets secret env vars before sandboxed Bash commands run. Here is why the default read policy was a hole, and how to close it.
Fix: 405 Method Not Allowed instead of 401 with JWT bearer in ASP.NET Core
A protected endpoint returning 405 instead of 401 almost always means routing rejected the HTTP verb before auth ran, or a cookie scheme stole the challenge. Here is how to tell which.
Why your ASP.NET Core JWT returns 401 even with a valid token
A valid token that still 401s almost always means the bearer handler never ran or ran under the wrong scheme. Check middleware order, the default scheme, the scheme name, and whether the header even reached the handler.
Fix: The seed entity for entity type 'X' cannot be added because a non-zero value is required for property 'Id'
HasData seeds an entity with a store-generated key but no explicit value. Give every seed row a stable non-zero Id, or switch to UseSeeding for generated keys.
How to add policy enforcement and audit logging to a Microsoft Agent Framework agent
Wire the Agent Governance Toolkit into a Microsoft Agent Framework 1.0 agent so every tool call is checked against a YAML policy and written to a tamper-evident audit trail. Full C# middleware, policy file, and a hash-chained audit sink.