skill-system-router

Original：🇺🇸 English

Translated

2 scripts

Meta-skill that teaches the Agent how to discover, select, execute, chain, and observe skills in the skill system. Load this skill when you need to: (1) find which skill can handle a capability, (2) execute a skill operation via its entrypoint, (3) chain multiple skill operations together, (4) check policy before executing, or (5) log skill execution for observability. This skill makes YOU the router — you decide what to run, in what order, based on context.

2installs

Sourcearthur0824hao/skills

Added on2026-02-24

NPX Install

npx skill4agent add arthur0824hao/skills skill-system-router

SKILL.md Content

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Skill System Router

You are the Router. This skill teaches you how to orchestrate other skills.

How It Works

User goal → Read skills-index.json → Match capabilities → Read skill manifest
→ Check policy → Execute entrypoints → Parse JSON output → Decide next step → Log

Step 0: Bootstrap (First Run Only)

Check if the project's AGENTS.md contains

## Skill System

.

If found: skip to Step 1 (already bootstrapped).
If not found: follow
```
scripts/bootstrap.md
```
to embed the skill system into this project.

This only runs once per project. After bootstrap, every future session reads AGENTS.md and knows about the skill system automatically.

Step 1: Discover Skills

Read

skills-index.json

(in the skills root directory, sibling to skill folders) to see available capabilities.

The index maps capabilities → skills and lists each skill's operations with descriptions and input params. Match the user's goal to capabilities. If no match, check if the goal can be decomposed into sub-capabilities.

If

skills-index.json

is missing or stale, regenerate it:

bash

bash "<this-skill-dir>/scripts/build-index.sh"

powershell

powershell.exe -NoProfile -ExecutionPolicy Bypass -File "<this-skill-dir>\scripts\build-index.ps1"

Step 2: Read Skill Manifest

Open the target skill's

SKILL.md

and find the

`skill-manifest`

fenced block. This gives you:

operations: what the skill can do, with input/output schemas
effects: side effects (used for policy check)
entrypoints: OS-specific commands to run

Full manifest spec:

references/manifest-spec.md

Step 3: Check Policy

Before executing, verify the skill's declared

effects

against the active policy profile:

sql

SELECT allowed_effects FROM skill_system.policy_profiles WHERE name = 'dev';

ALL effects in
```
allowed_effects
```
→ proceed
ANY effect NOT in
```
allowed_effects
```
→ ask the user before proceeding
No policy profile exists → ask the user

Standard effects:

db.read

,

db.write

,

proc.exec

,

fs.read

,

fs.write

,

net.fetch

,

git.read

,

git.write

Step 4: Execute

Determine OS:
```
OS
```
env =
```
Windows_NT
```
→ use
```
windows
```
entrypoint, otherwise
```
unix
```
Read the operation's
```
entrypoints
```
for your OS
Substitute
```
{param}
```
placeholders with actual values
Set cwd to the skill's directory
Run the command
Parse the last line of stdout as JSON — this is the result

Exit code ≠ 0 or last line not JSON → operation failed.

Step 5: Chain Operations

When a goal requires multiple skills/operations:

Execute first operation → parse JSON output
Use output values as input to the next operation (you decide the mapping)
Repeat until goal is met

You are intelligent — adapt based on intermediate results. This is better than a fixed pipeline because you can handle errors, skip unnecessary steps, and make contextual decisions.

Step 6: Log (Observability)

After non-trivial workflows, log for observability:

sql

INSERT INTO skill_system.runs(task_spec_id, status, started_at, effective_policy)
VALUES (NULL, 'running', NOW(), '{}'::jsonb) RETURNING id;

INSERT INTO skill_system.run_events(run_id, level, event_type, payload)
VALUES (<run_id>, 'info', 'step_completed',
  jsonb_build_object('skill', '<id>', 'operation', '<op>', 'status', '<ok|error>', 'duration_ms', <ms>));

UPDATE skill_system.runs SET status='succeeded', ended_at=NOW(),
  metrics=jsonb_build_object('steps', <n>, 'duration_ms', <ms>) WHERE id=<run_id>;

Skip logging for simple single-operation calls.

Insight Suggestion

After completing a non-trivial session (multi-step work, significant discussion, or debugging), consider suggesting an insight pass:

"Want me to run an insight pass on this session? It helps me learn your preferences for better collaboration next time."

This is a lightweight, optional prompt. Only suggest when:

The session had meaningful interaction (not a single-line fix)
The user hasn't already triggered insight extraction recently
The session contained signals worth capturing (frustration, satisfaction, style preferences)

If the user agrees, load

skill-system-insight

and follow

scripts/extract-facets.md

.

Common Patterns

Single operation: Goal → index lookup → execute one entrypoint → return result

Multi-step chain: Goal → op1.search → parse results → op2.store(using results) → done

Cross-skill chain: Goal → skill-A.op1 → use output as context → skill-B.op2 → rebuild index → done

Database

Uses tables from

skill-system-postgres

:

```
skill_system.policy_profiles
```
— effect allowlists
```
skill_system.runs
```
— execution records
```
skill_system.run_events
```
— step-level logs

skill

{
  "schema_version": "2.0",
  "id": "skill-system-router",
  "version": "1.0.0",
  "capabilities": ["skill-discover", "skill-execute", "skill-chain", "index-rebuild"],
  "effects": ["fs.read", "fs.write", "proc.exec", "db.read", "db.write"],
  "operations": {
    "rebuild-index": {
      "description": "Regenerate skills-index.json by scanning all skill manifests.",
      "input": {},
      "output": {
        "description": "Index file path and skill count",
        "fields": { "file": "string", "skill_count": "integer" }
      },
      "entrypoints": {
        "unix": ["bash", "scripts/build-index.sh"],
        "windows": ["powershell.exe", "-NoProfile", "-ExecutionPolicy", "Bypass", "-File", "scripts\\build-index.ps1"]
      }
    },
    "bootstrap": {
      "description": "Embed skill-system into project AGENTS.md (first run only).",
      "input": {},
      "output": {
        "description": "Path to updated AGENTS.md",
        "fields": { "agents_md_path": "string" }
      },
      "entrypoints": {
        "agent": "Follow scripts/bootstrap.md procedure"
      }
    }
  },
  "stdout_contract": {
    "last_line_json": false,
    "note": "rebuild-index prints summary to stdout; bootstrap is agent-executed."
  }
}