docs: add Myths vs Reality appendix + TeammateTool documentation

- Appendix D: Myths vs Reality
  - Myth: Hidden features with secret flags
  - Myth: Tasks API = autonomous agents
  - Myth: 100x faster claims
  - Reality: Documented strengths of Claude Code
  - How to spot reliable vs unreliable sources

- New: TeammateTool experimental feature documentation
  - Multi-agent orchestration capabilities
  - Execution backends (in-process, tmux, iTerm2)
  - Usage patterns (parallel specialists, swarm)
  - Clear warnings about experimental status
  - Community sources cited

- Cheatsheet: Features Méconnues (But Official!) section
  - Tasks API, Background Agents, TeammateTool
  - Session Forking, LSP Tool
  - Pro tip: Read the CHANGELOG

- Reference.yaml: Added line numbers for new sections

- Resource evaluation: Rejected low-quality social media post
  (docs/resource-evaluations/2026-01-27-claude-code-hidden-feature-social-post.md)

Addresses community misinformation while documenting real experimental features with proper sourcing.
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# Evaluation: "Claude Code Hidden Feature" Social Media Post
**Date**: 2026-01-27
**Evaluator**: Claude Sonnet 4.5
**Source Type**: Copied text (unsourced social media post)
**Verdict**: ❌ **REJECTED** (Score: 1/5)
---
## Summary
Social media post claiming Claude Code has a "hidden feature" for parallel agent execution, using aggressive marketing language and creating artificial FOMO. Post lacks citations and presents publicly documented features as "secrets."
---
## Content Summary
- **Main claim**: "Hidden feature" enables automatic spawning of parallel agents like a "team"
- **Mechanism described**: Feature flag that automatically creates agents for each task
- **Tone**: Marketing hyperbole ("retourne internet", "tu passes à côté d'un truc énorme")
- **Call to action**: "Find the flag with Perplexity"
- **Sources cited**: None
---
## Fact-Check Results
| Claim | Verified | Official Source | Verdict |
|-------|----------|-----------------|---------|
| "Hidden feature" | ❌ **FALSE** | [CHANGELOG v2.1.16](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md#2116---2026-01-22) | **Public** since Jan 2026 |
| "Tasks → auto-spawn agents" | ⚠️ **PARTIALLY TRUE** | [Tasks API docs](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md) | Sub-agents exist, not automatic |
| "CLAUDE_CODE_ENABLE_TASKS flag" | ✅ **TRUE** | [v2.1.19 release](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md#2119---2026-01-25) | Migration flag (revert), not activation |
| "Team coordination" | ⚠️ **PARTIALLY TRUE** | [TeammateTool gist](https://gist.github.com/kieranklaassen/4f2aba89594a4aea4ad64d753984b2ea) | Real but experimental, not "hidden" |
| "Retourne internet" / "Prendre de l'avance" | ❌ **MARKETING LIES** | N/A | Unverifiable hyperbole |
### Factual Corrections
**What is TRUE (and already officially documented):**
1. **Tasks API** (v2.1.16+): Task management with dependencies - [CHANGELOG](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md#2116---2026-01-22)
2. **Parallel sub-agents**: `Task` tool spawns independent agents - [Docs](https://code.claude.com/docs/en/sub-agents)
3. **TeammateTool**: Multi-agent orchestration (real, not hidden) - [Community gist](https://gist.github.com/kieranklaassen/4f2aba89594a4aea4ad64d753984b2ea)
4. **CLAUDE_CODE_ENABLE_TASKS=false**: Migration flag to **disable** new system - [v2.1.19](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md#2119---2026-01-25)
**What is FALSE:**
- ❌ Not "hidden" → Documented since v2.1.16 (Jan 22, 2026)
- ❌ Not recent → Released 5 days ago at evaluation time
- ❌ Flag doesn't "unlock" → It reverts to old system
- ❌ Not exclusive → Available to all Claude Code users
---
## Scoring & Decision
### Score: 1/5 ❌ - REJECT
**Rationale:**
1. **Fundamental dishonesty**: Presents public features as "hidden"
2. **FOMO creation**: Manipulative language designed to create urgency
3. **Zero sources**: No official citations = massive red flag
4. **Contradicts guide principles**: "Accuracy over marketing" (RULES.md line ~350)
5. **Zero documentary value**: All true facts already in CHANGELOG
**Why rejection is important:**
This guide has 15K+ lines and 66+ templates built on rigorous sourcing. **One low-quality source can contaminate credibility.** Readers must trust 100% of cited sources.
### What Would Have Justified Score 3+:
- ✅ Cite official CHANGELOG
- ✅ Professional, factual tone
- ✅ Pedagogical explanation (how/why use feature)
- ✅ Mention limitations and use cases
- ✅ Distinguish "experimental" from "stable" features
---
## Comparative Analysis
| Aspect | This Source | Our Guide (v3.15.0) | Gap? |
|--------|-------------|---------------------|------|
| **Tasks API (v2.1.16+)** | ⚠️ "Hidden" (false) | ✅ Documented (line 3200-3500) | No |
| **CLAUDE_CODE_ENABLE_TASKS** | ⚠️ Presented as "activation" | ✅ Documented (line 3213) | No |
| **Sub-agents parallel** | ⚠️ "Feature flag" | ✅ Documented (Task tool) | No |
| **TeammateTool** | ❌ Not mentioned | ❌ **GAP IDENTIFIED** | ✅ **YES** |
| **Swarm mode** | ❌ Not mentioned | ❌ **GAP IDENTIFIED** | ✅ **YES** |
| **Professional tone** | ❌ Marketing hyperbole | ✅ Factual & sourced | - |
### Real Gaps Identified (Independent of Source)
Despite this source's low quality, it revealed two real gaps in our guide:
1. **TeammateTool**: Real experimental feature not yet documented
- Confirmed by: [Community gist](https://gist.github.com/kieranklaassen/4f2aba89594a4aea4ad64d753984b2ea), [GitHub Issue #3013](https://github.com/anthropics/claude-code/issues/3013)
- Status: Partially feature-flagged, usable but unstable
2. **Swarm mode / claude-sneakpeek**: Parallel build enabling unreleased features
- Source: [GitHub mikekelly/claude-sneakpeek](https://github.com/mikekelly/claude-sneakpeek)
- Status: Unofficial method, unknown risks
---
## Technical Writer Agent Challenge
**Score adjustment**: 3/5 → 1/5 (challenge accepted)
**Key arguments from technical-writer agent:**
1. **"Score 3/5 too generous"** → "Fundamentally dishonest. Reject."
2. **"Negative pedagogical value"** → "Teaches bad practices: seek secrets vs read docs"
3. **"Zero documentary value"** → "All facts already in CHANGELOG. Adds nothing."
4. **"Test: remove marketing → what remains?"** → "Public facts. Value = 0."
5. **"Risk of precedent"** → "Next step: integrate unsourced Reddit threads?"
**Question returned**: *"Why hesitate to reject? Pressure to 'cover everything' even low quality?"*
**Answer**: No pressure. Standard applied: accuracy over coverage. This source fails quality bar.
---
## Actions Taken
### ❌ Not Integrated
- Did NOT cite this source in guide
- Did NOT create "Hidden Features" section (reinforces myth)
- Did NOT legitimize low-quality social media content
### ✅ Improvements Made (Independent of Source)
1. **Added TeammateTool documentation**
- Location: `guide/ultimate-guide.md` line 3294
- Content: Experimental status, capabilities, limitations, official sources
- Warning: Unstable, no official support
2. **Created "Myths vs Reality" appendix**
- Location: `guide/ultimate-guide.md` line 15257 (Appendix D)
- Sections:
- ❌ Myth: "Hidden features unlockable with flags"
- ❌ Myth: "Tasks API = autonomous agents"
- ❌ Myth: "100x faster than competitors"
- ✅ Reality: What makes Claude Code actually special
- How to spot reliable information
3. **Enhanced cheatsheet visibility**
- Location: `guide/cheatsheet.md` after "File References"
- Section: "Features Méconnues (But Official!)"
- Lists: Tasks API, Background Agents, TeammateTool, Session Forking, LSP Tool
- Pro tip: "Read the CHANGELOG—these aren't secrets!"
4. **Updated machine-readable index**
- Location: `machine-readable/reference.yaml`
- Added: TeammateTool (line 3294), Appendix D (line 15257)
- Added: Myths sections with line numbers
---
## Research Sources Used
### Official
- [Claude Code CHANGELOG v2.1.16](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md#2116---2026-01-22)
- [Claude Code CHANGELOG v2.1.19](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md#2119---2026-01-25)
- [Claude Code Docs - Sub-Agents](https://code.claude.com/docs/en/sub-agents)
### Community (Reliable)
- [kieranklaassen - TeammateTool Complete Guide (Gist)](https://gist.github.com/kieranklaassen/4f2aba89594a4aea4ad64d753984b2ea)
- [GitHub Issue #3013 - Parallel Agent Execution](https://github.com/anthropics/claude-code/issues/3013)
- [mikekelly/claude-sneakpeek (GitHub)](https://github.com/mikekelly/claude-sneakpeek)
- [Tim Dietrich - Parallel Subagents](https://timdietrich.me/blog/claude-code-parallel-subagents/)
- [Medium - Multi-agent parallel coding](https://medium.com/@codecentrevibe/claude-code-multi-agent-parallel-coding-83271c4675fa)
### Search Engines Used
- **Perplexity Search**: "Claude Code CLAUDE_CODE_ENABLE_TASKS feature flag parallel agents 2026"
- **Google WebSearch**: "site:github.com anthropics/claude-code TeammateTool"
- **WebFetch**: Official CHANGELOG, TeammateTool gist, claude-sneakpeek repo
---
## Final Decision
- **Score**: 1/5 ❌
- **Action**: **REJECT** - Do not integrate
- **Confidence**: Very High (rigorous fact-check completed)
- **Documentary value**: Zero
- **Gaps identified**: TeammateTool + Swarm mode (worth documenting with **official sources only**)
### Principle Applied
From RULES.md line ~350:
> **No Marketing Language**: Never use "blazingly fast", "100% secure", "magnificent", "excellent"
This source violates our core editorial principle. Rejection maintains guide integrity.
---
## Recommendation for Future
**Red flags checklist** (signs of misinformation):
- ❌ "Hidden feature that will blow your mind!"
- ❌ "Secret trick devs don't want you to know"
- ❌ No official source citations
- ❌ FOMO language: "falling behind if not using"
- ❌ Dramatic claims without evidence
**Trusted sources checklist**:
- ✅ Official [Claude Code docs](https://code.claude.com/docs)
- ✅ [GitHub CHANGELOG](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md)
- ✅ GitHub Issues with Anthropic staff responses
- ✅ Community resources citing official sources
- ✅ This guide (14+ evaluated resources, clear sourcing)
**Moral**: Truth > Hype. Accuracy > Coverage. Official sources > Rumors.
---
**Evaluation completed**: 2026-01-27
**Result**: Improved guide quality by rejecting low-quality source while documenting real gaps with proper sources.