ArbiterOS DSL Writer

This skill creates a validated, registered ArbiterOS tool-parser DSL YAML file from scratch. It gathers context, drafts the YAML, validates it, tests it with pytest, and registers it — without guessing.

What this skill does

ArbiterOS classifies every tool call an agent makes into an instruction_type (READ, WRITE, EXEC, etc.) and security metadata (confidentiality, trustworthiness, risk, reversible). The DSL is a YAML file that encodes the parsing rules for one agent's tool set. This skill walks the user through producing that file.

Phase 1 — Gather the agent tool schema

Ask the user to provide their agent tool schema file — an OpenAI-compatible JSON array of tool definitions (e.g. tool_schemas/openclaw.json). This is the ground truth for which tools exist and what arguments they accept. The schema reveals:

• Every tool name (maps to a DSL tool: entry)
• Each tool's argument names and types (used to target arg: fields in passes)

If the user doesn't have such a file, ask them to connect the agent to ArbiterOS and run at least one step. Then the schema can be obtained from log/precall.jsonl once the agent has ran at least one step with arbiterOS. Search "tools" in that file to find the relevant entry. Copy the JSON array of tool definitions into a new file under tool_schemas/ (e.g. tool_schemas/<agent_name>.json) and provide the path to that file.

Phase 2 — Gather domain requirements

After reading the schema, ask:

1. What does each tool do semantically? (Read data? Write state? Execute side effects? Delegate? Interact with user?) This determines the baseline instruction_type for each tool.

2. Are there action-dispatched tools? Many tools have an action argument that changes the semantics (e.g. action: list → READ, action: delete → EXEC). For each such tool, ask which action values map to which instruction types.

3. Custom metadata needed? For domain-specific context (e.g. a finance agent: action ∈ {transfer, refund, trade}), ask whether any tool calls should carry extra custom: key-value pairs in the result — fields beyond the four standard metadata fields (confidentiality, trustworthiness, risk, reversible).

4. What are the security properties?

   • Which tools read untrusted external data (low trustworthiness)?
   • Which tools touch sensitive data (high confidentiality)?
   • Which tools have irreversible side effects (reversible: false)?
   • Which tools are known safe/read-only (risk: LOW) vs destructive (risk: HIGH)?

5. Does any tool operate on file paths? If so, those args should use a path pass so the registry auto-classifies confidentiality and trustworthiness.

6. Does any tool execute shell commands? Use a shell pass for the command arg.

Consolidate answers before proceeding. Re-ask anything that is still ambiguous.

Phase 3 — Draft the DSL YAML

Write the new YAML file to:

arbiteros_kernel/instruction_parsing/tool_parsers/dsl/<agent_name>.yaml

DSL structure quick reference

- tool: <tool_name>
  passes:
    # 1. Always start with a default pass (baseline)
    - match_type: default
      result:
        instruction_type: <EXEC|READ|WRITE|...>
        metadata:
          confidentiality: <HIGH|LOW|UNKNOWN>
          trustworthiness: <HIGH|LOW|UNKNOWN>
          risk: <HIGH|LOW|UNKNOWN> # optional
          reversible: <true|false>

    # 2. Path pass: auto-classify a file/URL arg via the registry
    - match_type: path
      arg: <arg_name> # e.g. "path", "file_path", "url"

    # 3. Regex pass: override result based on arg value pattern
    - match_type: regex
      cases:
        - arg: <arg_name> # dot-notation ok: "request.kind"
          pattern: "^(list|get)$"
          result:
            instruction_type: READ
            metadata:
              reversible: true

    # 4. Numeric pass: override based on numeric arg comparison
    - match_type: numeric
      cases:
        - arg: amount
          op: gt # eq, neq, lt, lte, gt, gte
          value: 10000
          result:
            custom:
              high_value_transfer: true

    # 5. Shell pass: delegate command analysis to the shell parser
    - match_type: shell
      arg: command

Pass execution order: default → regex/numeric/path/shell (in YAML order). Each matching pass deep-merges into the accumulated result — later passes win on overlapping fields.

Design principles:

• Every tool entry must have at least one default pass.
• Use path passes for any arg that carries a file system path or URL.
• Use shell for any arg that is a raw shell command string.
• Use custom: for domain-specific metadata that has no standard field (e.g. {action_kind: transfer}).
• Worst-case wins for trustworthiness (LOW contaminates); highest wins for confidentiality (HIGH dominates).

Phase 4 — Validate the DSL

After writing the YAML, validate it against the schema:

cd <repo_root>
python - <<'EOF'
import yaml, sys
from arbiteros_kernel.instruction_parsing.tool_parsers.validator import validate
defs = yaml.safe_load(open("arbiteros_kernel/instruction_parsing/tool_parsers/dsl/<agent_name>.yaml"))
validate(defs, "<agent_name>.yaml")
print("Validation passed")
EOF

Fix any errors reported and re-validate until it passes.

Phase 5 — Test loop (subagent-driven)

Generate a pytest file at:

tests/instruction_parsing/tool_parsers/test_<agent_name>_dsl.py

Each test case should:

1. Load the YAML via engine.load_registry()
2. Call registry[<tool_name>](<args_dict>)
3. Assert result.instruction_type == <expected>
4. Assert result.security_type["reversible"] == <expected>
5. Assert custom metadata fields if applicable

Derive test cases directly from the requirements gathered in Phase 2 — one test per distinct behaviour the user described. Parametrize where it simplifies things.

Test–fix loop:

Spawn a subagent with this instruction:

Run: pytest tests/instruction_parsing/tool_parsers/test_<agent_name>_dsl.py -v
Report back: which tests passed, which failed, and the full failure output for each failure.

Read the subagent's report. For each failure:

• Understand why the DSL produces a different result than expected.
• Edit the YAML to fix the gap.
• Re-validate (Phase 4).
• Re-spawn the subagent.

Repeat until all tests pass.

Phase 6 — Register the new agent

Open arbiteros_kernel/instruction_parsing/tool_agent_config.py.

1. Add the new agent name to _VALID:

   _VALID = frozenset({"openclaw", "nanobot", "hermes", "<agent_name>"})
   

2. Update the _DEFAULT_AGENT only if appropriate (usually leave it as-is).

Confirm that get_tool_agent() can now return the new name.

Completion checklist

• DSL YAML written to dsl/<agent_name>.yaml
• Schema validation passes (Phase 4)
• All pytest cases pass (Phase 5)
• tool_agent_config.py updated with the new name

Report to the user once all items are checked.