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HomeDocsClaude Developer Platform 5 Nov 2026
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PDF Processing changedagents-and-tools/agent-skills/overview

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124124 * `scripts/`
125125 * `fill_form.py` (utility script)
126126 
127**Instructions:** Additional markdown files (`FORMS.md`, `REFERENCE.md`) containing specialized guidance and workflows
127**Instructions:** Additional Markdown files (`FORMS.md`, `REFERENCE.md`) containing specialized guidance and workflows
128128 
129129**Code:** Executable scripts (`fill_form.py`, `validate.py`) that Claude runs using bash, providing deterministic operations without loading their code into context
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163163Here’s how Claude loads and uses the custom `pdf-processing` Skill from the earlier examples (not the pre-built `pdf` Skill):
164164 
1651651. **Startup:** System prompt includes: `pdf-processing - Extract text and tables from PDF files, fill forms, merge documents. Use when working with PDF files or when the user mentions PDFs, forms, or document extraction.`
1662. **User request:** “Extract the text from this PDF and summarize it”
1673. **Claude calls:** `bash: cat pdf-processing/SKILL.md` → Instructions loaded into context
1684. **Claude determines:** Form filling is not needed, so `FORMS.md` is not read
1695. **Claude executes:** Uses instructions from `SKILL.md` to complete the task
1662. **User request:** “Extract the text from this PDF and summarize it.”
1673. **Claude calls:** `bash: cat pdf-processing/SKILL.md` → Instructions loaded into context.
1684. **Claude determines:** Form filling is not needed, so Claude doesn’t read `FORMS.md`.
1695. **Claude completes the task:** Uses the instructions from `SKILL.md`.
170170 
171171<Frame>
172 ![Skills loading into context window - showing the progressive loading of skill metadata and content](https://platform.claude.com/docs/images/agent-skills-context-window.svg)
172 ![Skills loading into the context window: the progressive loading of Skill metadata and content](https://platform.claude.com/docs/images/agent-skills-context-window.svg)
173173</Frame>
174174 
175175## Where Skills work
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208208 
209209**Pre-built Agent Skills:** These Skills are active when you create documents. Claude uses them with no setup required.
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211**Custom Skills:** Upload your own Skills as zip files through **Settings > Features**. Available on Pro, Max, Ultra, Team, and Enterprise plans with [code execution enabled](https://support.claude.com/en/articles/12111783-create-and-edit-files-with-claude). Custom Skills are individual to each user. They are not shared organization-wide and cannot be centrally managed by admins.
211**Custom Skills:** Upload your own Skills as zip files. Available on Pro, Max, Ultra, Team, and Enterprise plans with [code execution enabled](https://support.claude.com/en/articles/12111783-create-and-edit-files-with-claude).
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213213To learn more about using Skills in claude.ai, see the following resources in the Claude Help Center:
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304304 
305305## Limitations and constraints
306306 
307Claude Platform on AWS and Microsoft Foundry follow the same limitations as the Claude API in the following subsections. In addition, on Microsoft Foundry, the [Skill version download endpoint](https://platform.claude.com/docs/en/api/beta/skills/versions/download) (`GET /v1/skills/{skill_id}/versions/{version}/content`) is not supported.
307Claude Platform on AWS and Microsoft Foundry follow the same limitations as the Claude API in the following subsections. In addition, on Microsoft Foundry, the [Skill version download endpoint](https://platform.claude.com/docs/en/api/beta/skills/versions/download) (`GET /v1/skills/{skill_id}/versions/{version}/content`) is not available.
308308 
309309### Cross-surface availability
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320320 
321321Skills have different sharing models depending on where you use them:
322322 
323* **claude.ai:** Individual user only. Each team member must upload separately.
324323* **Claude API:** Workspace-wide. All workspace members can access uploaded Skills.
325* **Claude Code:** Personal (`~/.claude/skills/`) or project-based (`.claude/skills/`). Can also be shared through Claude Code Plugins.
326 
327claude.ai does not support centralized admin management or org-wide distribution of custom Skills.
324* **Claude Code:** Personal (`~/.claude/skills/`) or project-based (`.claude/skills/`). Can also be shared through Claude Code plugins.
328325 
329326### Runtime environment constraints
330327 
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