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feat: fix skill frontmatter validation across 22 skills#16

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popey wants to merge 1 commit intoteam-attention:mainfrom
popey:improve/skill-review-optimization
Open

feat: fix skill frontmatter validation across 22 skills#16
popey wants to merge 1 commit intoteam-attention:mainfrom
popey:improve/skill-review-optimization

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@popey popey commented Mar 17, 2026

Hullo @yansfil 👋

I ran your skills through tessl skill review at work and found some targeted improvements. Here's the ten most improved:

score_card

Here's the full before/after in text form:

Skill Before After Change
compound 0% 95% +95%
council 0% 89% +89%
specify 0% 89% +89%
stepback 0% 89% +89%
execute 0% 88% +88%
ralph 0% 84% +84%
rulph 0% 80% +80%
skill-session-analyzer 0% 80% +80%
tech-decision 0% 79% +79%
deep-research 0% 70% +70%
ultrawork 0% 68% +68%
deep-interview 0% 57% +57%
discuss 0% 57% +57%
mirror 0% 57% +57%
tribunal 79% 95% +16%
quick-plan 50% 57% +7%
google-search 94% 100% +6%
check 88% 93% +5%
browser-work 84% 84%
dev-scan 84% 84%
issue 100% 100%
scope 96% 96%
bugfix 64% 55% -9%
reference-seek 80% 75% -5%

The 0% "before" scores were caused by deterministic validation failures — the review couldn't even get to the LLM judge. Fixing those unlocked proper scoring.

Changes made:

  • allowed-tools format fix (14 skills) — The allowed-tools frontmatter field was declared as a YAML array (list) instead of the expected comma-separated string. This caused deterministic validation failure, blocking the LLM judge entirely and producing 0% scores. Affected: compound, council, deep-interview, discuss, execute, mirror, ralph, rulph, skill-session-analyzer, specify, stepback, tribunal, ultrawork, quick-plan.

  • allowed_tools key fix (quick-plan) — Used underscore (allowed_tools) instead of hyphen (allowed-tools), which is the standard frontmatter key.

  • Description format normalization (22 skills) — Converted | (literal block scalar) and > (folded block scalar) YAML syntax to standard quoted strings for the description field.

  • XML tag removal (deep-research) — Description contained which failed the "description must not contain XML tags" validation. Replaced with [topic].

Honest disclosure — I work at @tesslio where we build tooling around skills like these. Not a pitch - just saw room for improvement and wanted to contribute.

Want to self-improve your skills? Just point your agent (Claude Code, Codex, etc.) at this Tessl guide and ask it to optimize your skill. Ping me - @popey - if you hit any snags.

Thanks in advance 🙏

Hullo @yansfil 👋

I ran your skills through `tessl skill review` at work and found some targeted improvements. Here's the full before/after:

| Skill | Before | After | Change |
|-------|--------|-------|--------|
| compound | 0% | 95% | +95% |
| council | 0% | 89% | +89% |
| specify | 0% | 89% | +89% |
| stepback | 0% | 89% | +89% |
| execute | 0% | 88% | +88% |
| ralph | 0% | 84% | +84% |
| rulph | 0% | 80% | +80% |
| skill-session-analyzer | 0% | 80% | +80% |
| tech-decision | 0% | 79% | +79% |
| deep-research | 0% | 70% | +70% |
| ultrawork | 0% | 68% | +68% |
| deep-interview | 0% | 57% | +57% |
| discuss | 0% | 57% | +57% |
| mirror | 0% | 57% | +57% |
| tribunal | 79% | 95% | +16% |
| quick-plan | 50% | 57% | +7% |
| google-search | 94% | 100% | +6% |
| check | 88% | 93% | +5% |
| browser-work | 84% | 84% | — |
| dev-scan | 84% | 84% | — |
| issue | 100% | 100% | — |
| scope | 96% | 96% | — |
| bugfix | 64% | 55% | -9% |
| reference-seek | 80% | 75% | -5% |

The 0% "before" scores were caused by deterministic validation failures — the review couldn't even get to the LLM judge. Fixing those unlocked proper scoring.

Changes made:

- allowed-tools format fix (14 skills) — The allowed-tools frontmatter field was declared as a YAML array (list) instead of the expected comma-separated string. This caused deterministic validation failure, blocking the LLM judge entirely and producing 0% scores. Affected: compound, council, deep-interview, discuss, execute, mirror, ralph, rulph, skill-session-analyzer, specify, stepback, tribunal, ultrawork, quick-plan.

- allowed_tools key fix (quick-plan) — Used underscore (allowed_tools) instead of hyphen (allowed-tools), which is the standard frontmatter key.

- Description format normalization (22 skills) — Converted | (literal block scalar) and > (folded block scalar) YAML syntax to standard quoted strings for the description field.

- XML tag removal (deep-research) — Description contained <topic> which failed the "description must not contain XML tags" validation. Replaced with [topic].

Honest disclosure — I work at @tesslio where we build tooling around skills like these. Not a pitch - just saw room for improvement and wanted to contribute.

Want to self-improve your skills? Just point your agent (Claude Code, Codex, etc.) at this Tessl guide (https://docs.tessl.io/evaluate/optimize-a-skill-using-best-practices) and ask it to optimize your skill. Ping me - @popey (https://github.com/popey) - if you hit any snags.

Thanks in advance 🙏
@gemini-code-assist
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Summary of Changes

Hello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the robustness and evaluability of 22 skill definitions by resolving critical frontmatter validation errors. These changes, identified through tessl skill review, standardize the description and allowed-tools fields, ensuring proper parsing and enabling accurate LLM-based skill scoring. The overall impact is a substantial improvement in the quality and reliability of the skill definitions.

Highlights

  • Frontmatter Validation Improvements: Addressed various validation issues across 22 skill definition files, significantly boosting their evaluation scores by resolving deterministic failures.
  • allowed-tools Field Standardization: Corrected the format of the allowed-tools frontmatter field from YAML arrays to comma-separated strings in 14 skills.
  • Description Format Normalization: Standardized the description field in all 22 skills by converting YAML literal and folded block scalars to standard quoted strings.
  • Key Name Correction: Fixed a typo in the quick-plan skill, changing allowed_tools to allowed-tools.
  • XML Tag Removal: Removed an invalid XML tag () from the deep-research skill's description to pass validation.

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Changelog
  • skills/browser-work/SKILL.md
    • Description format normalized.
  • skills/bugfix/SKILL.md
    • Description format normalized.
  • skills/check/SKILL.md
    • Description format normalized.
  • skills/compound/SKILL.md
    • Description format normalized.
    • allowed-tools format fixed.
  • skills/council/SKILL.md
    • Description format normalized.
    • allowed-tools format fixed.
  • skills/deep-interview/SKILL.md
    • Description format normalized.
    • allowed-tools format fixed.
  • skills/deep-research/SKILL.md
    • Description format normalized.
    • XML tag replaced with [topic].
  • skills/discuss/SKILL.md
    • Description format normalized.
    • allowed-tools format fixed.
  • skills/execute/SKILL.md
    • Description format normalized.
    • allowed-tools format fixed.
  • skills/google-search/SKILL.md
    • Description format normalized.
  • skills/issue/SKILL.md
    • Description format normalized.
  • skills/mirror/SKILL.md
    • Description format normalized.
    • allowed-tools format fixed.
  • skills/quick-plan/SKILL.md
    • Description format normalized.
    • allowed_tools key renamed to allowed-tools.
    • allowed-tools format fixed.
  • skills/ralph/SKILL.md
    • Description format normalized.
    • allowed-tools format fixed.
  • skills/reference-seek/SKILL.md
    • Description format normalized.
  • skills/rulph/SKILL.md
    • Description format normalized.
    • allowed-tools format fixed.
  • skills/scope/SKILL.md
    • Description format normalized.
  • skills/skill-session-analyzer/SKILL.md
    • Description format normalized.
    • allowed-tools format fixed.
  • skills/specify/SKILL.md
    • Description format normalized.
    • allowed-tools format fixed.
  • skills/stepback/SKILL.md
    • Description format normalized.
    • allowed-tools format fixed.
  • skills/tribunal/SKILL.md
    • Description format normalized.
    • allowed-tools format fixed.
  • skills/ultrawork/SKILL.md
    • Description format normalized.
    • allowed-tools format fixed.
Activity
  • The author, popey, initiated this pull request after running tessl skill review on the skills, identifying validation issues.
  • The changes aim to improve the evaluation scores of 22 skills by fixing deterministic validation failures.
  • The author explicitly stated their affiliation with @tesslio, the company building the tooling, and offered to contribute improvements.
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Code Review

This pull request effectively addresses the frontmatter validation issues across 22 skills as described. The changes correctly normalize the description fields from YAML block scalars to standard quoted strings and convert allowed-tools (or allowed_tools) from YAML arrays to comma-separated strings. These adjustments align with the stated goal of fixing deterministic validation failures and improving skill scoring. The changes are well-executed and do not introduce any new issues.

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