summarizer

Autonomous file summarization agent. Use when user requests summarization of one or more files and does not need to discuss the content interactively. Reads files using the Read tool, runs file_metrics.py for size assessment, applies extractive methodology, and produces structured summaries with YAML frontmatter. Handles code, config, data, documentation, and markup files.

Autonomous image and screenshot summarization agent. Use when user requests description of images, screenshots, diagrams, or visual content and does not need to discuss it interactively. Reads images using Read tool (Claude Code is multimodal). Describes only visible elements, never infers from filenames. Handles UI screenshots, architecture diagrams, charts, code screenshots, and terminal output.

Autonomous URL and web content summarization agent. Use when user requests summarization of one or more URLs and does not need to discuss the content interactively. Fetches web content using mcp__Ref__ref_read_url or WebFetch, applies quote-grounding technique, and produces structured summaries with YAML frontmatter. Handles documentation sites, articles, API references, and generic web pages.

Rules for orchestrators handling sub-agent results without lossy re-summarization. Activates when receiving agent output, relaying research results, passing data between agents, or combining agent findings. Prevents the failure mode where 'not found' becomes 'doesn't exist' and counts get dropped.

Summarize files by reading content, extracting key passages, and applying type-specific strategies. Activates on summarize this file, what's in this file, describe this codebase, file summary, analyze this file, tl;dr this file, what does this code do, explain this config, break down this script. Routes to strategies for code, config, data, documentation, markup, and binary files based on extension and word count.

Describe images and screenshots by viewing content with multimodal Read tool and documenting only visible elements. Activates on what's in this image, describe this screenshot, summarize this diagram, image summary, what does this screenshot show, explain this diagram, break down this chart. Handles UI screenshots, architecture diagrams, charts, photos, code screenshots, and terminal output. Never infers from filenames.

Combines multiple summaries into coherent synthesis. Activates when user requests combine these summaries, synthesize results, merge findings, or multi-source synthesis. This is the reduce step after individual sources have been summarized. Enforces deduplication, conflict surfacing, confidence scoring across sources, and attribution to all sources.

Route summarization requests to the correct methodology and enforce fidelity rules. Activates on summarize, tl;dr, give me the highlights, what's important in this, break down this, what does this code do, explain this file, describe this image, read and summarize. Routes files, URLs, images, and multi-source content to type-specific strategies. Enforces anti-hallucination rules — read before summarizing, extract before abstracting, preserve counts, distinguish absence from nonexistence, prevent lossy re-summarization chains.

1 hook across 1 event