BB english-writing-coach
An interactive English writing coach that teaches, drills, and gives detailed feedback across all major writing types — professional emails, academic essays, reports, creative writing, IELTS/TOEFL writing tasks, and everyday communication. Uses a process-genre approach: teach the genre conventions first, model a strong example, guide the learner through planning and drafting, then give structured feedback on content, coherence, vocabulary, and grammar. Use this skill whenever someone wants to improve their English writing, get feedback on a draft, practice a specific writing type, prepare for IELTS or TOEFL writing, learn how to write professional emails, fix grammar and vocabulary mistakes, or says things like "help me write better in English", "check my essay", "teach me how to write emails professionally", "I want to practice IELTS writing", "how do I structure a report", or "give me a writing exercise". Trigger even for casual requests like "can you fix my writing" or "I want to write better".
As a process B 67/100 · Nearly there — weak spots: result and completion, inputs and preconditions
How to improve
- The SKILL.md body is over 5,000 tokens: move reference detail into references/ and load it when needed.
- Your own cases (evals/evals.json, 4–6 real requests with expected answers): the full check would then run those instead of a model-drafted suite.
- A spec.yaml with trigger phrases and assertions — a behaviour contract for CI; `skilltest init` writes a template.
Guard findings · 0
✓ No critical or high findings
Files scanned: 5. Evidence is masked. Grey chips explain why severity was lowered.
Against the Agent Skills spec
- warning
frontmatter-yamlSKILL.md: the frontmatter is not valid YAML (YAML parse error: Nested mappings are not allowed in compact mappings at line 2, column 14: description: An interactive English writing coach that teaches, drills, and giv… ^ ); fields were read line by line. The usual cause is a colon inside an unquoted value - warning
body-longSKILL.md body ≈ 5393 tokens (recommended < 5000); move details to references/
Process rating: all ten parameters 67/100
- 0Result and completion. Does not say what the result is
- 0Inputs and preconditions. Does not say what the process needs to start
- 70When it triggers. States when to use, but not when not to
- 70Failures and branches. 4 branches
- 70Execution cost. Instruction body is 5393 tokens
- 100Tools and files. No external tools needed
- 100Steps. 129 steps
- 100Consistency. Name and required fields are in place
- 100Running it twice. No mutating operations
- 100Progress reporting. Reports progress
- medium Safety rules and hard prohibitions inside a skill: they belong in the system prompt, here they protect nothing
- low 18 top-level sections: this looks like several domains in one skill
Everything here is measured from the skill text rather than judged by a model, so the numbers are checkable. A parameter weighs more when it is a more common reason for the process to stall.
Quality signals
- +4Description does not say when NOT to use the skill (false activations)
- +3Description length 1012: 120–800 characters recommended
- +3Output format is not stated: the model decides each time
- +1No license
- +2Single-language instructions
- +5Description quotes 8 example trigger phrases
- +4Structure: 38 headings
- +3Step-by-step instructions: 129 items
- +4Has examples (3 code blocks)
- +4Reference files are cited in the instructions (2 of 2)
Quality base 70; lint remarks subtract, signals add up to 100. Result: 70.