f2s-doc-pdf - SKILL.md Agent Skill

name: f2s-doc-pdf description: Convert a PDF technical design into Markdown and save it under req-docs, with optional flow-description completion; triggers: PDF转MD、按方案实现前的 PDF、PDF to Markdown、technical design PDF

Execution scope: technical design documents are written to .Knowledge/req-docs/; rule capabilities are still loaded from the config-root rules/skills.

Orchestration (main / sub agent)

The semantics of subAgent / switchAgentVerification use the unified entry as the only source of truth: Cursor/Claude read the config-root rules/f2s-flow2spec-unified-entry.*; Codex reads .codex/topics/f2s-flow2spec-unified-entry.md (same source, mirrored by flow2spec init). This document does not restate those semantics.
Do not split by default: follow-up questions and disk writes must be completed in the main agent session. A sub agent cannot ask the user follow-up questions.
Optional split: enable only when subAgent=true and the PDF exceeds the threshold (> 50 pages or > ~5MB of text). The sub agent is responsible only for the first PDF-to-MD draft and writes .Knowledge/req-docs/<name>.md; it must not ask follow-up questions and must not write the "Flow Description" section. The main agent then handles follow-up questions and flow-description completion.
Verification is performed by the writing agent by default. This skill does not bind to cross-agent verification.

Convert a PDF Technical Design to Markdown (and Complete Flow Descriptions)

The user provides one argument after this skill: the local path to the PDF technical design document (for example ~/Downloads/技术方案.pdf or .Knowledge/req-docs/某草稿.pdf). Follow the steps below to convert the PDF into Markdown, save it under .Knowledge/req-docs/, and guide the user to complete flow descriptions when needed.

Step 1: Read the PDF and Convert It to Markdown

If sub-agent splitting is enabled (PDF > 50 pages or > ~5MB), the sub agent is responsible only for the PDF-to-MD draft and writes req-docs/<name>.md; it does not ask follow-up questions and does not write flow descriptions. The main agent takes over the following steps. Read the PDF file provided by the user, extract its text content (preserving tables, sections, lists, code blocks, and other structure as much as possible), and organize it as Markdown.
Save it to .Knowledge/req-docs/. Recommended path: .Knowledge/req-docs/<design-name>.md. The filename should be the original PDF filename with .pdf replaced by .md.
If the directory does not exist, create it before writing.
After saving, tell the user: "The PDF has been converted to Markdown and saved as xxx.md."

Step 2: Ask the User for Flow Diagrams (Optional but Recommended)

Embedded flow diagrams in the PDF cannot be parsed directly into steps and branches. If code will be implemented based on the diagram, the user needs to provide additional material.

Tell the user: "The document may contain flow diagrams, and I cannot reliably parse the steps and branches inside those diagrams from the PDF. If you will later implement code from this technical design (see the implement-tech-design rule), I recommend completing the flow description:

Option 1: send the relevant flow diagram images in this conversation; I will parse them and write a textual version into the MD file above.
Option 2: describe each API/flow in text directly (for example: 1. Is the user logged in? 2. Query a table. 3. Check a field -> return the result); I will write it into the MD file as provided. If the document has no flow diagram or you do not want to provide one now, reply skip, and I will finish this skill."

If the user replies skip or clearly says no flow description is needed: tell the user, "Provide the MD path above in the conversation and say that you want to implement code from the technical design; I will follow the implement-tech-design rule." Then stop.
If the user provides a flow diagram image or text: proceed to Step 3.

Step 3: Write the Flow Description into the MD File

If the user provides an image: parse the steps, decision branches, and returns in the image, then organize them as textual steps.
If the user provides text: use it directly.
Append the flow content to the end of that MD file, or add a new "Flow Description" section. Example format:

## Flow Description (provided by the user / parsed from a flow diagram)

### Example API A
1. Frontend sends the request
2. Backend queries the latest record from a table
3. Check: does a certain ID exist? yes -> return true, no -> return false
4. Return result

### Example API B
1. Is the user logged in? -> no: return 401
2. Is it expired? -> yes: return 403
…

After saving, tell the user: "The flow description has been written to xxx.md. Next, provide this MD path in the conversation and say that you want to implement code from the technical design; I will follow the implement-tech-design rule."

Constraints and Summary

Path: the PDF path provided by the user may be absolute or relative to the project root. The output MD should be saved to .Knowledge/req-docs/<design-name>.md (req-docs stores implementation documents, while stock-docs stores knowledge-source documents).
This skill only handles: PDF -> Markdown conversion plus optional flow-description completion. It does not implement code. After completion, you may tell the user: provide the generated MD path in the conversation and say that implementation should follow the technical design; the AI will follow f2s-implement-tech-design.mdc.