BF gumtree-bb-browser
Search [Gumtree UK](https://www.gumtree.com/) from the terminal with bb-browser: property and flats to buy or rent, general second-hand deals, pets, used cars, and more local classifieds—structured JSON plus first-image Markdown for assistants. Includes gumtree/search and gumtree/listing adapters; requires bb-browser.
As a process F 46/100 · Will not run — References files that are not bundled: firstImageUrl
How to improve
- Say in the description WHEN to use the skill ("use when…", example requests): that is the agent's main cue.
- The text references files that are not there: add them or drop the references.
- 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: 4. Evidence is masked. Grey chips explain why severity was lowered.
Against the Agent Skills spec
- warning
description-no-whendescription does not say WHEN to use the skill (no "use when") - warning
missing-refreference to a missing file: firstImageUrl
Process rating: all ten parameters 46/100
- 0Tools and files. 1 referenced file(s) missing: firstImageUrl
- 0Result and completion. Does not say what the result is
- 0Progress reporting. Says nothing while it works
- 20When it triggers. No condition that starts the skill
- 30Running it twice. 2 mutating operations with no state check
- 40Consistency. Frontmatter name (gumtree-bb-browser) differs from the folder (gumtree-search-uk)
- 70Inputs and preconditions. Inputs and preconditions are listed
- 100Steps. 20 steps
- 100Failures and branches. 1 branches, has a failure section
- 100Execution cost. Instruction body is 984 tokens
- medium Safety rules and hard prohibitions inside a skill: they belong in the system prompt, here they protect nothing
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
- +5Description has no quoted example phrases that should trigger the skill
- +4Description does not say when NOT to use the skill (false activations)
- +3Output format is not stated: the model decides each time
- +1No license
- +2Single-language instructions
- +3Description length 319: enough signal without eating the budget
- +4Structure: 9 headings
- +3Step-by-step instructions: 20 items
- +4Has examples (5 code blocks)
Quality base 70; lint remarks subtract, signals add up to 100. Result: 66.