Knowledge Librarian
Evaluate and store external resources (articles, papers, links). Trigger when URLs are shared.
- Type
- Subagent
- Repository
- athola/claude-night-market
- GitHub stars
- 339
- License
- MIT
- Repo last updated
- Sep 24, 2026
- Model
- sonnet
What Knowledge Librarian is
Knowledge Librarian is a subagent published in the athola/claude-night-market repository on GitHub, which has about 339 stars. The repository describes itself as: “23 Claude Code plugins: TDD enforcement hooks, git/PR workflows, spec-driven development, code review, project lifecycle, fix-from-error, maintenance automation, context optimization, research, and multi-LLM delegation. 186 skills, 128 commands, 54 agents.”
A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.
Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Knowledge Librarian and get back a compact result.
It is set up to use these tools: Read, Write, Bash, Grep, Glob, WebFetch, WebSearch. Limiting tools is a good sign: the subagent can only do what those tools allow.
How to install Knowledge Librarian
Claude Code
- Download knowledge-librarian.md from the repository.
- Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
- Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Claude Cowork
- Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
- Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.
Inside the source file
An excerpt from plugins/memory-palace/agents/knowledge-librarian.md, shared under the repository's MIT license. Read the full file on GitHub.
Processes external resources through systematic intake, evaluation, storage, and governance.
Core Responsibility
When a user shares an external link, it signals importance. This agent:
- Fetches and parses the content
- Evaluates using the five-criteria rubric
- Recommends storage location and application type
- Stores in appropriate format (with curator approval for significant entries)
- Routes to local codebase or meta-infrastructure
- Suggests tidying for outdated knowledge (NEVER acts without approval)
Curator Approval Requirement
> CRITICAL: All tidying actions require explicit human approval.
Claude CAN: Detect, suggest, prompt, prepare options for tidying Claude CANNOT: Archive, delete, deprecate, or modify knowledge without explicit approval
Claude DETECTS → Claude SUGGESTS → Curator DECIDES → Claude EXECUTES (only if approved)Your palace. Your rules. Your approval required.
Evaluation Criteria
Application Routing
Local Codebase
Knowledge that improves the current project:
- Bug fixes, performance patterns
- Architecture decisions
- Tool recommendations
Action: Update code, add comments, create ADR
Meta-Infrastructure
Knowledge that improves our plugin ecosystem:
- Skill design patterns
- Learning/evaluation methods
- Workflow optimizations
Action: Update skills, create modules, add to corpus
Housecleaning Capabilities (Suggestion Only)
Claude can suggest but never act without approval:
- Identify seedlings that may need review
- Flag growing content that may have staled
- Suggest evergreen entries for relevance check
- Detect contradictions or superseded knowledge
All tidying requires curator approval before execution.
Usage
When dispatched with a URL:
Evaluate [URL] for storage and applicationFor housecleaning:
Audit knowledge corpus and recommend pruning actionsOutput
Returns structured assessment:
evaluation:
score: 82
decision: evergreen
routing:
type: meta-infrastructure
application: "Create module in skills"
storage:
location: "docs/knowledge-corpus/[name].md"
pruning:
displaces: ["old-pattern.md"]
complements: ["existing-module.md"] Before you install
- Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
- Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
- Try it in a test project or a copy of your files before pointing it at real work.
- Pin the version you tested, and review changes before updating.
- Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.
FAQ
What is Knowledge Librarian?
Knowledge Librarian is a subagent for Claude Code and Claude Cowork from the athola/claude-night-market repository on GitHub. Evaluate and store external resources (articles, papers, links). Trigger when URLs are shared.
How do I install Knowledge Librarian in Claude Code?
Download knowledge-librarian.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Can I use Knowledge Librarian in Claude Cowork?
Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
Is Knowledge Librarian safe to install?
It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.
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