Derek Lewis (@dlewis) header
Derek Lewis (@dlewis) profile picture

CTO @silexdata focused on AIOps & compute | AI maximalist | Former @Bloomberg and still recovering from health IT/enterprise SWE | Occasional sax player

Nashville, TN
Joined October 2009
Photo by Derek Lewis (@dlewis)Photo by Derek Lewis (@dlewis)Photo by Derek Lewis (@dlewis)Photo by Derek Lewis (@dlewis)Photo by Derek Lewis (@dlewis)Photo by Derek Lewis (@dlewis)Photo by Derek Lewis (@dlewis)Photo by Derek Lewis (@dlewis)Photo by Derek Lewis (@dlewis)
Derek Lewis retweeted
The AIOps agents at @SilexData make 400+ MCP tool calls per task. Running every call as Python in Pydantic Monty, filtering output before the model reads it, cut cost 26 to 32% and solved all 10 incidents. Direct tool calling solved 8. CTO @dlewis on how pydantic.io/silex
2
1
25
1,151
And it just doesn't stop:
There has been a security incident at Trigger. We have emailed the owners of all impacted accounts. We’ll be providing more information but for now the focus is on giving the impacted account owners what they need to mitigate. trigger.dev/blog/security-in…
206
My GitHub app workflow for keeping my agents away from my actual gh credentials and letting them do work as a role through a GItHub app:
Claude Code and Opus 5.5 are pretty good at generating the workflow, but the gist is the agent has access to a secret with the GH app private key and there's a signing script that uses the private key to generate the signed JWT from the private key, which is then used to get a GH installation access token that is then used to make the GH API calls. The script can be used as a gh wrapper or as a git credential helper. If you're concerned about your agents not having access to your real gh credentials, then mount the role's GH app private key in a container and expose the private key as a secret to it, which the wrapper script will then use for all GH operations.
147
Amazing -- good to see something like this come out of a difficult year for F1
KIMI ANTONELLI IS THE 2026 F1 WORLD CHAMPION!!! 🏆 The youngest to ever do it at 20 years and 68 days old! #F1 #MexicoGP
103
Not as crazy of an idea as you'd think. When I worked at Bloomberg they had their own Layer 2 protocol (name escapes me) that was developed to do multicast on a network of OS/32 Perkin Elmers back in the early 80s (prior to TCP & IP), which were the first machines they had. I'm sure it is still in place today. Parts of it were also written in Fortran and used DLPI on Solaris/AIX/etc. to hook into the network stack when they ported it from OS/32 to UNIX.
Can I make a new network protocol or is that too far into psychosis
1
149
This is the right take.
IaC is dead. Sorry DevOps / SREs / Cloud Engineers but you're in for the same roller coaster as Devs. AI can manage infra change better than you. Unfortunately for IaC, we don't need code because with the actual system source code and the infra, AIs have everything needed to determine change sets / approvals and dev env lensing. btw, Effect Oriented Programming probably will help you get there; but that is inevitable for your codebase.
4
2
1
73
48,282
Also, when did this new Claude reset hit?
300
Somehow I'm in Anthropic's CVP, but my account isn't verified? Also, how do I get verified? I don't see a link anywhere with the Ultra announcement.
55
100% this. Multiple accounts per MCP server though I hear that one is done but maybe not rolled out to everyone?
Mutliple accounts support in Claude Code Desktop App AND Claude on Web oh and fable 5.5 ofc
1
70
Claude Duet running in the cloud is really limiting from a browser perspective. So many sites block it.
2
6
502
Going to drink some Earl Grey tonight.
3
97
The best captain in Star Trek and an incredible individual/actor. RIP.
In lieu of flowers, memorial contributions may be made to: Johns Hopkins Alzheimer’s Disease Research Center Fund    alzresearch.org/giving/ Alzheimer’s Foundation of America Caregiver Resources     alzfdn.org/donate/ Photo Credit: Tommy Garcia
2
48
Not sure why Claude Duet won’t retain the original format of an attachment. Tried attaching some Word docs to have it redline and it converts them to raw text, so now I have to jump over to Claude proper and do work.
45