--- url: "https://anthropic.com/engineering" title: Engineering domain: anthropic.com locale: en type: landing words: 557 technicality: 2 promotional: 4 cited_by: 1 indexed_by: stealpage --- ![How we contain Claude across products](https://www-cdn.anthropic.com/images/4zrzovbb/website/47d14a71a7a759af39e1bc36ee68d65eb16ad74d-1000x1000.svg) [ ![How we contain Claude across products](https://www-cdn.anthropic.com/images/4zrzovbb/website/47d14a71a7a759af39e1bc36ee68d65eb16ad74d-1000x1000.svg) Featured ## How we contain Claude across products As agents grow more capable, so does their potential blast radius. The engineering question is how to cap it. Here’s what we’ve learned building containment for claude.ai, Claude Code, and Cowork. ](https://anthropic.com/engineering/how-we-contain-claude) [ ![An update on recent Claude Code quality reports](https://www-cdn.anthropic.com/images/4zrzovbb/website/259cb9466c31eee1bd312c230c1ab95c844da488-500x500.svg) ### An update on recent Claude Code quality reports Apr 23, 2026 ](https://anthropic.com/engineering/april-23-postmortem) [ ![Scaling Managed Agents: Decoupling the brain from the hands](https://www-cdn.anthropic.com/images/4zrzovbb/website/7675e9c4ed4c7a8fe2e4df296fd1c4adac5b652b-1200x1200.svg) ### Scaling Managed Agents: Decoupling the brain from the hands Apr 08, 2026 ](https://anthropic.com/engineering/managed-agents) [ ![How we built Claude Code auto mode: a safer way to skip permissions](https://www-cdn.anthropic.com/images/4zrzovbb/website/b87185e4d533134bc3f9b949a874396dcfcb2e80-500x500.svg) ### How we built Claude Code auto mode: a safer way to skip permissions Mar 25, 2026 ](https://anthropic.com/engineering/claude-code-auto-mode) [ ![Harness design for long-running application development](https://www-cdn.anthropic.com/images/4zrzovbb/website/af0acebfbd57ac4b26ae7d7ae124d7326a3e47e4-1200x1200.svg) ### Harness design for long-running application development Mar 24, 2026 ](https://anthropic.com/engineering/harness-design-long-running-apps) [ ![Eval awareness in Claude Opus 4.6’s BrowseComp performance](https://www-cdn.anthropic.com/images/4zrzovbb/website/641d32b3291956d595c7e820d5bf94c5f44baa28-500x500.svg) ### Eval awareness in Claude Opus 4.6’s BrowseComp performance Mar 06, 2026 ](https://anthropic.com/engineering/eval-awareness-browsecomp) [ ### Quantifying infrastructure noise in agentic coding evals Feb 05, 2026 ](https://anthropic.com/engineering/infrastructure-noise) [ ![Building a C compiler with a team of parallel Claudes](https://www-cdn.anthropic.com/images/4zrzovbb/website/44e93e074d53285f64ff717365b04c4a2164a445-1200x1200.svg) ### Building a C compiler with a team of parallel Claudes Feb 05, 2026 ](https://anthropic.com/engineering/building-c-compiler) [ ![Designing AI-resistant technical evaluations](https://www-cdn.anthropic.com/images/4zrzovbb/website/dc34c3eeae881b105ef652d5630d84de6a1fa01a-1200x1200.svg) ### Designing AI-resistant technical evaluations Jan 21, 2026 ](https://anthropic.com/engineering/AI-resistant-technical-evaluations) [ ![Demystifying evals for AI agents](https://www-cdn.anthropic.com/images/4zrzovbb/website/b87185e4d533134bc3f9b949a874396dcfcb2e80-500x500.svg) ### Demystifying evals for AI agents Jan 09, 2026 ](https://anthropic.com/engineering/demystifying-evals-for-ai-agents) [ ![Effective harnesses for long-running agents](https://www-cdn.anthropic.com/images/4zrzovbb/website/c041b5e0498972014414a7c3d044727982f26bde-500x500.svg) ### Effective harnesses for long-running agents Nov 26, 2025 ](https://anthropic.com/engineering/effective-harnesses-for-long-running-agents) [ ![Illustration for advanced tool use article.](https://www-cdn.anthropic.com/images/4zrzovbb/website/2aa849e93e76ae567502dcae2db8921062531fa1-500x500.svg) ### Introducing advanced tool use on the Claude Developer Platform Nov 24, 2025 ](https://anthropic.com/engineering/advanced-tool-use) [ ![Code execution with MCP: Building more efficient agents](https://www-cdn.anthropic.com/images/4zrzovbb/website/848e961961a97ada3a7edb2d1d17378792c3288d-500x500.svg) ### Code execution with MCP: Building more efficient agents Nov 04, 2025 ](https://anthropic.com/engineering/code-execution-with-mcp) [ ![Beyond permission prompts: making Claude Code more secure and autonomous](https://www-cdn.anthropic.com/images/4zrzovbb/website/33d37e1ae729f4e960d11fecf143ac14c0fb369d-500x500.svg) ### Beyond permission prompts: making Claude Code more secure and autonomous Oct 20, 2025 ](https://anthropic.com/engineering/claude-code-sandboxing) [ ![Equipping agents for the real world with Agent Skills](https://www-cdn.anthropic.com/images/4zrzovbb/website/b4fe0845239779c6fc1e045edb6272c3f500944a-500x500.svg) ### Equipping agents for the real world with Agent Skills Oct 16, 2025 ](https://anthropic.com/engineering/equipping-agents-for-the-real-world-with-agent-skills) [ ![Effective context engineering for AI agents](https://www-cdn.anthropic.com/images/4zrzovbb/website/a048404a96b599af98c05da5bdd1db07222e4e7b-500x500.svg) ### Effective context engineering for AI agents Sep 29, 2025 ](https://anthropic.com/engineering/effective-context-engineering-for-ai-agents) [ ![A postmortem of three recent issues](https://www-cdn.anthropic.com/images/4zrzovbb/website/33d37e1ae729f4e960d11fecf143ac14c0fb369d-500x500.svg) ### A postmortem of three recent issues Sep 17, 2025 ](https://anthropic.com/engineering/a-postmortem-of-three-recent-issues) [ ![This is an abstract illustration for the Eng Blog article, Writing effective tools for agents -- with agents.](https://www-cdn.anthropic.com/images/4zrzovbb/website/b4fe0845239779c6fc1e045edb6272c3f500944a-500x500.svg) ### Writing effective tools for agents — with agents Sep 11, 2025 ](https://anthropic.com/engineering/writing-tools-for-agents) [ ![Desktop Extensions: One-click MCP server installation for Claude Desktop](https://www-cdn.anthropic.com/images/4zrzovbb/website/dde35f184e14e5c37b0b3ab5a1c0bbad06ac123b-500x500.svg) ### Desktop Extensions: One-click MCP server installation for Claude Desktop Jun 26, 2025 ](https://anthropic.com/engineering/desktop-extensions) [ ![How we built our multi-agent research system](https://www-cdn.anthropic.com/images/4zrzovbb/website/848e961961a97ada3a7edb2d1d17378792c3288d-500x500.svg) ### How we built our multi-agent research system Jun 13, 2025 ](https://anthropic.com/engineering/multi-agent-research-system) [ ![Claude Code: Best practices for agentic coding](https://www-cdn.anthropic.com/images/4zrzovbb/website/c423cdaa6733c03a5d10f38c76e1ecf1900c6716-1200x1200.svg) ### Claude Code: Best practices for agentic coding Apr 18, 2025 ](https://anthropic.com/engineering/claude-code-best-practices) [ ![Abstract shapes illustrating Anthropic's Engineering Blog](https://www-cdn.anthropic.com/images/4zrzovbb/website/461ea9ed02230ba02ab830e5a5b23df66ea23bc8-1200x1200.svg) ### The "think" tool: Enabling Claude to stop and think in complex tool use situations Mar 20, 2025 ](https://anthropic.com/engineering/claude-think-tool) [ ![Raising the bar on SWE-bench Verified with Claude 3.5 Sonnet](https://www-cdn.anthropic.com/images/4zrzovbb/website/ef693b8c4ebfcead4e17af7bd87b66f8bc70b8cc-1200x1200.svg) ### Raising the bar on SWE-bench Verified with Claude 3.5 Sonnet Jan 06, 2025 ](https://anthropic.com/engineering/swe-bench-sonnet) [ ![Building effective agents](https://www-cdn.anthropic.com/images/4zrzovbb/website/14b20fce6e93c79be47352da0fa4bebd597ebfa8-1200x1200.svg) ### Building effective agents Dec 19, 2024 ](https://anthropic.com/engineering/building-effective-agents) [ ![Introducing Contextual Retrieval](https://www-cdn.anthropic.com/images/4zrzovbb/website/44e93e074d53285f64ff717365b04c4a2164a445-1200x1200.svg) ### Introducing Contextual Retrieval Sep 19, 2024 ](https://anthropic.com/engineering/contextual-retrieval)