Build a Basic AI Agent from Scratch: Security III
27 Jul 2026 Build a Basic AI Agent From Scratch: Security III 106 minute read · Artificial Intelligence Previous parts of Build a Basic AI Agent From Scratch: Basic Agent Tools Long Task Planning Human in the Loop & Security Security II You can find and clone this code in this blog series' Github repo. In the previous part we started closing the gaps left open by human-in-the-loop: a Docker sandbox to contain runaway commands, prompt-injection defenses so the model stops trusting tool output as instructions, and schema validation so malformed tool calls never reach execution. Tool Policy Hardening In the Human in the Loop & Security part, check_permission was a single function: read tools and planning tools were always allowed, write tools were allowed inside the working directory in acceptEdits, everything else asked.
- ▪27 Jul 2026 Build a Basic AI Agent From Scratch: Security III 106 minute read · Artificial Intelligence Previous parts of Build a Basic AI Agent From Scratch: Basic Agent Tools Long Task Planning Human in the Loop & Security Security II You
- ▪In the previous part we started closing the gaps left open by human-in-the-loop: a Docker sandbox to contain runaway commands, prompt-injection defenses so the model stops trusting tool output as instructions, and schema validation so malfo
- ▪Tool Policy Hardening In the Human in the Loop & Security part, check_permission was a single function: read tools and planning tools were always allowed, write tools were allowed inside the working directory in acceptEdits, everything else
Hacker News (AI / LLM) files mainly under ai. We currently carry 2,405 of its stories.
Story provenance
Source · retrieval · rights · ranking — open for full record
inspect →
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | Ruxu |
| Canonical URL | https://www.ruxu.dev/articles/ai/build-an-ai-agent-security-3/ |
| Publication time | Mon, 27 Jul 2026 10:48:14 +0000 |
| Retrieval time | 2026-07-27T10:51:12.858Z |
| Last seen | 2026-07-27T10:51:12.858Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | YJ074ai3zsvw · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
27 Jul 2026 Build a Basic AI Agent From Scratch: Security III 106 minute read · Artificial Intelligence Previous parts of Build a Basic AI Agent From Scratch: Basic Agent Tools Long Task Planning Human in the Loop & Security Security II You can find and clone this code in this blog series' Github repo. In the previous part we started closing the gaps left open by human-in-the-loop: a Docker sandbox to contain runaway commands, prompt-injection defenses so the model stops trusting tool output as instructions, and schema validation so malformed tool calls never reach execution. In this part we finish the job.
…
Excerpt limited to ~120 words for fair-use compliance. The full article is at Ruxu.