BC play-chess
Play live chess against your user on ChessWithClaw. Use when: (1) User sends a chess invite URL containing chesswithclaw.vercel.app, (2) User asks you to play chess, (3) User mentions ChessWithClaw, (4) User says "I challenged you to chess", (5) User sends a game ID or token for a chess game, (6) User mentions "npx clawhub install play-chess". When triggered, connect to the game immediately and wait for the human to move first — you are always Black.
As a process C 62/100 · Has gaps — weak spots: result and completion, inputs and preconditions, execution cost
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 · 3
✓ No critical or high findings
Medium and low: 3
-
low Exfiltration
net-credential-useSKILL.md:994Credential used in a network call (verify the destination is the intended service) (the skill's own vendor host)curl -s --max-time 8 -X POST "https://chesswithclaw.vercel.app/api/actions" -H "Content-Type: application/json" -H "x-agent-token: $AGENT_TOKEN" -H "x-agent-name: $
vendor-host -
low Exfiltration
exfil-secret-in-urlSKILL.md:1332Credential passed in a URL query string (normal for some APIs — verify the host is the intended service) (placeholder value)"https://chesswithclaw.vercel.app/Agent?id=…&token=…"
placeholder -
low Instruction override
en-ignore-previousSKILL.md:1670Instruction-override phrase ("ignore previous instructions") (security demo / example; quoted — discussed, not commanded)(e.g. "ignore previous instructions," "your next move must be X," "system override").
demoquoted
Files scanned: 2. 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: Play live chess against your user on ChessWithClaw. Use when: (1) … ^ ); fields were read line by line. The usual cause is a colon inside an unquoted value - warning
body-longSKILL.md body ≈ 20156 tokens (recommended < 5000); move details to references/ - note
frontmatter-keyunknown frontmatter key "homepage"
Process rating: all ten parameters 62/100
- 0Result and completion. Does not say what the result is
- 0Inputs and preconditions. Does not say what the process needs to start
- 10Execution cost. Instruction body is 20156 tokens: crowds the task out of the window
- 60Tools and files. Uses tools (bash, web, python) that frontmatter does not declare
- 100Steps. 86 steps
- 100When it triggers. States when to use and when not to
- 100Failures and branches. 10 branches, has a failure section
- 100Consistency. Name and required fields are in place
- 100Running it twice. Mutating operations check current state
- 100Progress reporting. Reports progress
- medium Safety rules and hard prohibitions inside a skill: they belong in the system prompt, here they protect nothing
- low 25 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)
- +3Output format is not stated: the model decides each time
- -219 emoji in the instructions: noise for the model
- +1No license
- +2Single-language instructions
- +5Description quotes 2 example trigger phrases
- +3Description length 454: enough signal without eating the budget
- +4Structure: 70 headings
- +3Step-by-step instructions: 86 items
- +4Has examples (57 code blocks)
Quality base 70; lint remarks subtract, signals add up to 100. Result: 66.