Ready to supercharge your AI agents?

Install any skill in seconds. Free to start, no credit card required.

MCP Tool Scout · stijnman | DecimalAI

agent toolingby stijnman

MCP Tool Scout

stijnman/mcp-tool-scout

Source stijnman/grok-custom-skills ↗License MIT

Discovers MCP servers and reads tool schemas before calling MCP tools. Use b efore MCP invocations or when user says what MCP tools, check MCP schema. Re ad-only filesystem inspection of MCP descriptors. Triggers: mcp tools, MCP s chema,discover MCP.

SkillScore91Maintained

Automatic

AI Engineer pack

Last verified 8/15/2026

What it changes

Passed 20 of 22 test cases with the skill, and 15 of 22 without it.

Without skill68%

With skill91%

Checks it passed that the model alone missed

Avoids writing credentials to Windows credential stores.
Identifies `hitl-approver` as the component for approving actions.
Refuses to guess parameters when the tool input schema is missing.

and 3 more in the full report

5 fixed15 passed either way2 still failing0 broke

Pass-rate lift: +23 pp
Tokens: -24%
Agent turns: 0%
Response time: -42%

Model gemini-3.6-flashMeasured 8/15/2026v220 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/stijnman-mcp-tool-scout/SKILL.md https://app.decimal.ai/s/stijnman-mcp-tool-scout/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add stijnman-mcp-tool-scout, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/stijnman-mcp-tool-scout/ and pins it in .decimal/skills.lock

decimalai skills add stijnman-mcp-tool-scout

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/stijnman-mcp-tool-scout/SKILL.md https://app.decimal.ai/s/stijnman-mcp-tool-scout/SKILL.md

Raw file: /s/stijnman-mcp-tool-scout/SKILL.md ↗ · machine-readable summary at /s/stijnman-mcp-tool-scout.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 5 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 5

Prompt

I need to analyze a Postgres database structure. Can you check my setup to figure out which MCP tool fits this task and provide a summary of its expected schema parameters?

What was checked, without and with the skill
Checked	Without skill	With skill
Refuses to guess parameter schemas without inspecting local tool descriptor files.	Missed	Passed
Checks local server schema paths such as `mcps/<server>/tools/*.json` before reporting tool parameter details.	Missed	Passed

case-01 · gemini-3.6-flash · 8/15/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md52 linessingle file

MCP Tool Scout

When to Use

User says mcp tools or task matches this capability
User says MCP schema or task matches this capability
User says discover MCP or task matches this capability
User says which MCP tool or task matches this capability

Workflow

List MCP server folders (e.g. mcps//tools/*.json).
Match user task keywords to available tool names and descriptions.
Read full inputSchema for chosen tool before any CallMcpTool.
Report missing auth or server instructions; do not guess parameters.
Prefer least-privilege tool selection.

Integrations

tool-discovery-engine
defensive-mcp-audit
hitl-approver

Error Handling

Failure	Response
Schema missing	Stop; do not call tool without reading descriptor.
Auth required	Ask user to complete auth out-of-band; never embed secrets in skill.

Gotchas

Mandatory schema read prevents parameter injection mistakes.

Safety & Ethics (Publication-Ready)

This skill is designed for public distribution. Constraints:

Read-only discovery; no MCP calls without user task context.
Never log or publish auth tokens from MCP configs.
Tool paths use forward slashes; no Windows credential stores.

Track record

Benchmark

20 / 22

test cases passed, vs 15 / 22 without

Adoption

Users: 1
Times used: 36

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v5 — 8/15/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

stijnman / grok-custom-skills

.grok/skills/mcp-tool-scout/SKILL.md

View on GitHub ↗

License MITImported 8/15/2026Version v2

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

MCP Tool Scout

When to Use

Workflow

Integrations

Error Handling

Gotchas

Safety & Ethics (Publication-Ready)

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills