MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Create context save points to preserve conversation state before breaks, risky changes, or compaction.
$ npx skills add qf-studio/navigator --skill nav-marker -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install qf-studio/navigator nav-marker --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/qf-studio/navigator.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/nav-marker .claude/skills/nav-marker && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "nav-marker" agent skill from https://github.com/qf-studio/navigator/tree/main/skills/nav-marker into .claude/skills/nav-marker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nav-marker", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/qf-studio/navigator/tree/main/skills/nav-markerType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add qf-studio/navigator --skill nav-marker -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install qf-studio/navigator nav-marker --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/qf-studio/navigator.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/nav-marker .agents/skills/nav-marker && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "nav-marker" agent skill from https://github.com/qf-studio/navigator/tree/main/skills/nav-marker into .agents/skills/nav-marker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nav-marker", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add qf-studio/navigator --skill nav-marker -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install qf-studio/navigator nav-marker --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/qf-studio/navigator.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/nav-marker .cursor/skills/nav-marker && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "nav-marker" agent skill from https://github.com/qf-studio/navigator/tree/main/skills/nav-marker into .cursor/skills/nav-marker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nav-marker", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/qf-studio/navigator.git --path skills/nav-marker--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add qf-studio/navigator --skill nav-marker -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install qf-studio/navigator nav-marker --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/qf-studio/navigator.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/nav-marker .gemini/skills/nav-marker && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "nav-marker" agent skill from https://github.com/qf-studio/navigator/tree/main/skills/nav-marker into .gemini/skills/nav-marker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nav-marker", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install qf-studio/navigator nav-markerInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add qf-studio/navigator --skill nav-marker -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/qf-studio/navigator.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/nav-marker .github/skills/nav-marker && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "nav-marker" agent skill from https://github.com/qf-studio/navigator/tree/main/skills/nav-marker into .github/skills/nav-marker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nav-marker", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add qf-studio/navigator --skill nav-marker -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install qf-studio/navigator nav-marker --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/qf-studio/navigator.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/nav-marker .opencode/skills/nav-marker && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "nav-marker" agent skill from https://github.com/qf-studio/navigator/tree/main/skills/nav-marker into .opencode/skills/nav-marker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nav-marker", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
nav-markerCreate context save points to preserve conversation state before breaks, risky changes, or compaction.
Nav Marker is an agent skill from qf-studio/navigator. Create context save points to preserve conversation state before breaks, risky changes, or compaction. Use when user says "save my progress", "create checkpoint", "mark this point", or before clearing context.
Its SKILL.md is about 2.6k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `functions/marker_compressor.py`).
It sits in Agent Workflows. The repository describes itself as: Finish What You Start — Context engineering for Claude Code. Sessions last 20+ exchanges instead of crashing at 7. The licence is MIT.
4 steps, taken from the step headings in SKILL.md.
Read from SKILL.md and the folder at commit 3bb9eac. It shows what the files ask for, not the result of running them.
Pre-approves these tools, so the agent can use them without asking each time:
ReadWriteBashFrom allowed-tools in the SKILL.md frontmatter.
Ships script files (Python), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Nav Marker loads about 2.6k tokens when it runs. Until then it costs about 55 tokens; SKILL.md has 461 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
The automated check noted patterns worth knowing about, such as sudo or a known installer.
allowed-tools: Read, Write, BashAutomated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
The full file from qf-studio/navigator at commit 3bb9eac, republished under its MIT licence (© qf-studio). 461 words, ~2,636 tokens.
.claude/skills/nav-marker/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.Create context markers - save points that preserve conversation state so you can resume work later without re-explaining everything.
Invoke this skill when the user:
DO NOT invoke if:
Verify .agent/.context-markers/ directory exists:
mkdir -p .agent/.context-markersIf user provided name:
If no name provided:
marker-{YYYY-MM-DD}-{HHmm}marker-2025-10-16-1430Ask user for optional note:
Creating marker: [name]
Add a note? (optional - helps remember context later)
Example: "OAuth working, need to add tests"
Note:IMPORTANT: You MUST actively capture ToM sections (User Intent, Corrections, Belief State).
Create marker document with this structure:
# Context Marker: [name]
**Created**: [YYYY-MM-DD HH:MM]
**Note**: [user's note or "No note provided"]
---
## Conversation Summary
[Summarize last 10-15 messages:
- What user was working on
- Key decisions made
- Problems solved
- Current progress state
]
## Documentation Loaded
[List docs that were Read during session:
- Navigator: ✅ .agent/DEVELOPMENT-README.md
- Task: TASK-XX-feature.md
- System: project-architecture.md
- SOPs: [if any]
]
## Files Modified
[List files with Write/Edit calls:
- src/auth/login.ts (implemented OAuth)
- src/routes/auth.ts (added endpoints)
- tests/auth.test.ts (created tests)
]
## Current Focus
[What user is working on right now:
- Feature: Authentication with OAuth
- Phase: Integration complete, testing pending
- Blockers: [if any]
]
## Technical Decisions
[Key architectural choices:
- Using passport.js over next-auth (better control)
- JWT tokens in httpOnly cookies (XSS protection)
- Redis for session storage (scalability)
]
## Next Steps
[What to do after restore:
1. Finish writing tests for OAuth flow
2. Add error handling for failed logins
3. Document setup in README
]
## User Intent & Goals (ToM) [CAPTURE ACTIVELY]
[Theory of Mind section - captures user's mental state for better restoration]
**⚠️ CRITICAL: Analyze conversation to extract these - do not leave empty!**
**Primary goal this session**:
[What the user was ultimately trying to accomplish - not just the surface task]
- Review conversation for "I want to...", "The goal is...", "We need to..."
- Infer from task context if not explicitly stated
**Stated preferences**:
[Any preferences expressed during session:
- Communication style (concise/detailed)
- Code patterns preferred
- Confirmation behavior wanted
]
- Look for "I prefer...", "Don't do...", "Always use..."
**Corrections made**:
[Important corrections that should persist:
- "Should be /users not /user (plural convention)"
- "Prefer functional components over class"
- "Always use TypeScript strict mode"
]
- Look for "No, I meant...", "Actually...", "Not X, use Y"
- These MUST be captured to avoid repeating mistakes
## Belief State [CAPTURE ACTIVELY]
[Captures mutual understanding state for accurate restoration]
**⚠️ CRITICAL: Infer from conversation - do not leave empty!**
**What user knows**:
[User's demonstrated knowledge level:
- Familiar with Express, new to Passport
- Knows about JWT, unfamiliar with refresh tokens
- Senior developer, skip basics
]
**Assumptions I made**:
[Key assumptions during session:
- Using Redis for sessions (confirmed by user)
- Auth endpoints follow /api/auth/* pattern
- Testing with Jest + React Testing Library
]
**Uncertainty areas**:
[Questions that weren't fully resolved:
- Not sure if user wants social logins beyond Google
- Rate limiting requirements unclear
- Error message format preferences unknown
]
## Loop State (if in loop mode)
[Capture loop mode state for resumption - skip if not in loop mode]
**Iteration**: [N]/[MAX] (e.g., 3/5)
**Phase**: [INIT|RESEARCH|IMPL|VERIFY|COMPLETE]
**State Hash**: [6-char hash for continuity]
**Completion Indicators**:
- [ ] Code committed
- [ ] Tests passing
- [ ] Documentation updated
- [ ] Ticket closed
- [ ] Marker created
**EXIT_SIGNAL**: [true/false]
**Stagnation Count**: [N]/[THRESHOLD]
## Knowledge Graph State (v6.0.0+)
[Capture graph state for restoration - skip if no knowledge graph]
**Check if graph exists**:
```bash
PLUGIN_DIR="${CLAUDE_PLUGIN_ROOT:-$(cat "${NAVIGATOR_CONFIG_HOME:-${XDG_CONFIG_HOME:-$HOME/.config}/navigator}/plugin-root" 2>/dev/null)}"
[ -d "$PLUGIN_DIR/skills" ] || PLUGIN_DIR="$HOME/.claude/plugins/marketplaces/navigator-marketplace"
if [ -f ".agent/knowledge/graph.json" ]; then
python3 "$PLUGIN_DIR/skills/nav-graph/functions/graph_manager.py" --action stats --graph-path .agent/knowledge/graph.json
fiMemories surfaced this session: [List memories that were queried or created:
Concepts active: [Concepts relevant to current work:
Graph queries made: [Knowledge graph queries from this session:
This allows restoration to re-surface relevant memories when resuming.
To restore this marker: ```bash Read .agent/.context-markers/[filename] ```
Or use: /nav:markers and select this marker
### Step 4: Save Marker File
Write marker to file:
Write( file_path: ".agent/.context-markers/[timestamp]_[name].md", content: [generated marker content] )
Filename format: `{YYYY-MM-DD-HHmm}_{name}.md`
Example: `2025-10-16-1430_before-big-refactor.md`
### Step 4.5: Verify Marker Creation
After creating marker, verify it was written successfully:
```bash
# Verify file exists and is non-empty
if [ -f ".agent/.context-markers/[filename]" ] && [ -s ".agent/.context-markers/[filename]" ]; then
# Calculate checksum for verification
checksum=$(md5 -q ".agent/.context-markers/[filename]" 2>/dev/null || md5sum ".agent/.context-markers/[filename]" | cut -d' ' -f1)
# Log to central marker log
echo "[$(date -u +"%Y-%m-%dT%H:%M:%SZ")] ✅ Marker created: [filename] (checksum: $checksum)" >> .agent/.marker-log
echo "✅ Marker verified successfully"
else
echo "❌ Marker creation failed - file missing or empty"
exit 1
fiMarker verification ensures:
Show success message with verification details:
✅ Context marker created!
Marker: [name]
File: .agent/.context-markers/[filename]
Size: [X] KB (~[Y] tokens)
Checksum: [md5-hash]
Verified: ✅
This marker captures:
- Last [N] messages of conversation
- Files you were working on
- Technical decisions made
- Next steps to continue
To restore later:
- Start new session
- Say "load marker [name]"
- Or use /nav:markers to list all markers
Logged to: .agent/.marker-logcreate_marker.py: Generates marker content from conversation analysis
User: "Save my progress, taking lunch"
→ Creates marker: "lunch-break-2025-10-16"
→ Captures current state
→ User resumes after lunch: "Load my lunch marker"User: "Mark this before I refactor routing"
→ Creates marker: "before-routing-refactor"
→ If refactor fails, restore marker
→ If refactor succeeds, delete markerUser: "End of day checkpoint"
→ Creates marker: "eod-2025-10-16"
→ Note: "OAuth done, tests tomorrow"
→ Next morning: "Load yesterday's marker"Automatic (via nav-compact skill):
→ Creates marker: "before-compact-2025-10-16-1500"
→ Compact clears conversation
→ Marker preserves knowledge
→ Next session: Auto-offers to restoreGood marker names:
lunch-break (clear when/why)before-api-refactor (indicates purpose)feature-complete (marks milestone)eod-friday (specific timing)Bad marker names:
temp (not descriptive)marker1 (meaningless)test (confusing)When to create markers:
Marker directory missing:
Creating .agent/.context-markers/ directory...
✅ Ready to save markersDuplicate marker name:
⚠️ Marker "[name]" already exists
Options:
1. Overwrite (replace existing)
2. Append timestamp (create "[name]-v2")
3. Choose different name
Your choice [1-3]:Insufficient context:
⚠️ Very little context to save (< 5 messages)
Markers work best when there's significant progress to preserve.
Continue anyway? [y/N]:Marker creation is successful when:
.agent/.context-markers//nav:markers cleanThis skill provides same functionality as /nav:marker command but with natural language invocation.
© qf-studio, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
SKILL.md and 1 other file in skills/nav-marker of qf-studio/navigator.
Open the folder on GitHubat commit 3bb9eac
Nav Marker next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Nav Marker this skillqf-studio/navigator | 355 | — | ~2.6k | Automated safety check: Notes | MIT | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| Hook Development for Claude Code Pluginsanthropics/claude-plugins-official | 38k | 10 repos | ~4.1k | Automated safety check: Notes | Apache-2.0 | |
| Using Superpowersfarm-fe/farm | 5.6k | 36 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Executing Plans Inlineobra/superpowers | 297k | 2 repos | ~5.1k | Automated safety check: Pass | MIT | |
| Skill CreatorAzure/azqr | 796 | 89 repos | ~8.2k | Automated safety check: Pass | Apache-2.0 |
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
anthropics/claude-plugins-official
Explains how to write Claude Code plugin hooks, both prompt-based checks and bash commands, for events such as PreToolUse, Stop and SessionStart.
farm-fe/farm
A skill your agent uses when starting any conversation - establishes how to find and use skills, requiring Skill tool invocation before ANY response including clarifying questions
obra/superpowers
Has the agent carry out an implementation plan itself, task by task in the current session, keeping a ledger, proving each step with a test and ending with one whole-branch review.
Azure/azqr
Create new skills, modify and improve existing skills, and measure skill performance.
anthropics/claude-plugins-official
Explains how to write agents for Claude Code plugins: the markdown file with YAML frontmatter, trigger descriptions, model and color settings, and system prompt design.
qf-studio/navigator
Load Navigator documentation navigator when starting development session, resuming work, or beginning new feature.
qf-studio/navigator
Create REST/GraphQL API endpoint with validation, error handling, and tests.
qf-studio/navigator
Generate backend tests (unit, integration, mocks) for existing code.
qf-studio/navigator
Create database migration with schema changes and rollback. An agent skill from qf-studio/navigator.
qf-studio/navigator
Create React/Vue component with TypeScript, tests, and styles.
qf-studio/navigator
Generate frontend component tests (React Testing Library, Vue Test Utils, snapshot) for existing components.
Categories
Create context save points to preserve conversation state before breaks, risky changes, or compaction. Nav Marker is an agent skill from qf-studio/navigator. Create context save points to preserve conversation state before breaks, risky changes, or compaction.
Nav Marker fits situations like: user says save my progress; create checkpoint; mark this point; before clearing context.
Run `npx skills add qf-studio/navigator --skill nav-marker -a claude-code`. Or copy the skill folder (skills/nav-marker in qf-studio/navigator) into .claude/skills/nav-marker in your project. Claude Code loads it when a task matches its description.
Run `npx skills add qf-studio/navigator --skill nav-marker -a codex`. Or copy the skill folder (skills/nav-marker in qf-studio/navigator) into .agents/skills/nav-marker in your project. Codex loads it when a task matches its description.
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add qf-studio/navigator --skill nav-marker -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/nav-marker, .gemini/skills/nav-marker, .github/skills/nav-marker and .opencode/skills/nav-marker in your project.
Going by SKILL.md and its folder, Nav Marker needs Python for the scripts in its folder. Our summary lists: Python 3. Its frontmatter pre-approves these tools: Read, Write, Bash.
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.
Nav Marker is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
About 2.6k tokens (SKILL.md is roughly 11k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
Skills that share tags, products or a category with Nav Marker: MCP Server Builder (anthropics/skills, 180k stars), Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Using Superpowers (farm-fe/farm, 5.6k stars) and Executing Plans Inline (obra/superpowers, 297k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
qf-studio (a GitHub organization) maintains it in qf-studio/navigator, which has 355 GitHub stars. The repository holds 32 skills in this directory. The repository was last updated on October 8, 2026.
Source: qf-studio/navigator on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.