fix: quote argument-hint values in SKILL.md frontmatter (Copilot CLI 1.0.65)

[thejesh23]

Summary

Copilot CLI 1.0.65 made argument-hint in skill frontmatter strictly a
string. The unquoted form used throughout .claude/skills/ and
.agents/skills/ is parsed by YAML as a flow sequence (array), which
makes the CLI refuse to load the skill.

This PR quotes the value in every affected SKILL.md so it parses as a
string. No prose, semantics, or field ordering changed.

The YAML rule

argument-hint: followed by an unquoted [ is a YAML flow sequence, not
a string:

# Before — YAML array (breaks Copilot CLI 1.0.65)
argument-hint: [optional topic or context]

# After — YAML string (correct)
argument-hint: "[optional topic or context]"

Where the value already contains double quotes, single quotes are used to
wrap the whole thing (e.g. diagram, thoughtbox-onboard).

Files touched

56 SKILL.md files — 28 under .agents/skills/ and 28 under
.claude/skills/ (the two trees are duplicates of each other).

All 77 argument-hint occurrences across the repo now parse as YAML
strings — verified with a Python yaml.safe_load pass over every
SKILL.md.

Files already using <...> (e.g. ulysses-protocol, theseus-protocol,
supabase, assumptions, eval, knowledge, peer-notebook-delivery-guard,
hdd) were untouched — those are already strings under YAML rules.
Files already fully quoted (ulc-loop, thoughtbox-research, status)
were also untouched.

Related

• [BUG] argument-hint YAML frontmatter with brackets causes React error #31 and unrecoverable TUI hang anthropics/claude-code#22161 — latent equivalent bug tracked on Claude Code

Test plan

• yaml.safe_load over every SKILL.md in the repo — 77/77
  argument-hint values parse as str, 0 errors
• Spot-checked files with embedded double quotes (diagram,
  thoughtbox-onboard) now use single quotes as the outer wrapper
• Load a fixed skill under Copilot CLI 1.0.65+ and confirm the
  argument hint renders as text

[vercel]

@thejesh23 is attempting to deploy a commit to the Thoughtbox Team on Vercel.

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[greptile-apps]

Greptile Summary

This PR fixes skill frontmatter so argument hints parse as strings.

• Quotes bracket-style argument-hint values in .agents/skills/.
• Applies the same updates to mirrored .claude/skills/ files.
• Uses single quotes where the hint text contains embedded double quotes.

Confidence Score: 5/5

This looks safe to merge.

No blocking issues found in the changed code.

No files need attention.

T-Rex Logs

What T-Rex did

• Ran the pre-artifact parser to establish base counts by parsed type.
• Validated the post-artifact parser results to confirm head counts, zero YAML errors, and preserved embedded quotes for key diagrams and thoughtbox onboarding.
• Assessed content preservation in SKILL.md after artifact, noting 56 changed lines with 56 quote-only changes and no frontmatter drift.
• Saved reproducible scripts for parsing and comparison as artifacts along with command-output captures.

_{Ran code and verified through T-Rex}

Important Files Changed

Filename	Overview
.agents/skills/diagram/SKILL.md	Changed the bracket-style hint with embedded quoted examples into a single-quoted YAML string.
.agents/skills/implement/SKILL.md	Changed the bracket-style hint into a double-quoted YAML string.
.agents/skills/thoughtbox-onboard/SKILL.md	Changed the hint with embedded quoted examples into a single-quoted YAML string.
.claude/skills/diagram/SKILL.md	Mirrors the .agents diagram skill quoting change.
.claude/skills/implement/SKILL.md	Mirrors the .agents implement skill quoting change.
.claude/skills/thoughtbox-onboard/SKILL.md	Mirrors the .agents Thoughtbox onboarding skill quoting change.

_{Reviews (1): Last reviewed commit: "fix: quote argument-hint values in SKILL..." | Re-trigger Greptile}

[thejesh23]

Tracking issue: #409 — captures the bug diagnosis and reproducer separately for anyone searching the repo who lands there before this PR.