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UAT: Tool YAML config capability fields must be top-level, not nested under `capability:` key #5013

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opened 2026-04-09 00:48:04 +00:00 by HAL9000 · 1 comment

HAL9000 commented

2026-04-09 00:48:04 +00:00

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Bug Report

Feature Area: Tools & Skills — Tool Registration / Tool Configuration Files

Severity: Critical (blocks correct tool registration for all users following the spec)

What Was Tested

Tool YAML configuration file parsing via agents tool add --config <file>.

Specifically: how capability metadata fields (writes, read_only, checkpointable, checkpoint_scope, write_scope, side_effects, idempotent, unsafe, timeout) are read from the YAML config.

Expected Behavior (from spec)

The spec's Tool Configuration Files section (§ Tool Configuration Files, JSON Schema at line ~33614, YAML examples at line ~33919) defines capability fields as top-level properties in the tool YAML:

name: local/run-migrations
description: "Run database migrations"
source: custom
code: |
  def run(input_data): ...

writes: true
write_scope: "database:migrations"
checkpointable: true
checkpoint_scope: "transaction"
side_effects:
  - "schema_mutation"
idempotent: false
timeout: 120

The spec's JSON Schema (additionalProperties: false) lists writes, read_only, checkpointable, checkpoint_scope, write_scope, side_effects, idempotent, unsafe, timeout as top-level properties — NOT nested under a capability: key.

Actual Behavior (from code)

Tool.from_config() in src/cleveragents/domain/models/core/tool.py reads capability from a nested capability: dict:

# Tool.from_config() — lines 443-447
cap_data = config.get("capability")
capability = (
    ToolCapability.model_validate(cap_data) if cap_data else ToolCapability()
)

This means:

A user who writes a spec-compliant YAML with top-level writes: true will have their tool registered with writes: false (the default), silently ignoring their capability declaration.
The only way to set capability metadata is via the non-spec capability: nested key, which is not documented in the spec's JSON Schema or YAML examples.

Steps to Reproduce

Create a spec-compliant tool YAML:

name: local/test-tool
description: "Test tool"
source: custom
code: |
  def run(input_data):
      return {"result": "ok"}
writes: true
checkpointable: true

agents tool add --config test-tool.yaml

Show it:

agents tool show local/test-tool

Expected: Writes: true, Checkpointable: true
Actual: Writes: false, Checkpointable: false (capability fields silently ignored)

Code Location

src/cleveragents/domain/models/core/tool.py — Tool.from_config() method, lines 443–481
src/cleveragents/domain/models/core/tool.py — Validation.from_config() method, lines 642–693

Fix Required

Tool.from_config() must be updated to read capability fields from both the top-level config dict (spec-compliant) AND the nested capability: dict (backward compat). The top-level fields should take precedence when present:

# Read top-level capability fields (spec-compliant format)
cap_data = {
    "writes": config.get("writes", False),
    "write_scope": config.get("write_scope"),
    "checkpointable": config.get("checkpointable", False),
    "checkpoint_scope": config.get("checkpoint_scope"),
    "side_effects": config.get("side_effects", []),
    "idempotent": config.get("idempotent", False),
    "read_only": config.get("read_only", False),
    "unsafe": config.get("unsafe", False),
}
# Also support nested capability: dict (backward compat)
nested_cap = config.get("capability", {})
if nested_cap:
    cap_data.update(nested_cap)
capability = ToolCapability(**cap_data)

The same fix is needed in Validation.from_config().

Automated by CleverAgents Bot
Supervisor: UAT Testing | Agent: uat-tester

## Bug Report **Feature Area:** Tools & Skills — Tool Registration / Tool Configuration Files **Severity:** Critical (blocks correct tool registration for all users following the spec) --- ## What Was Tested Tool YAML configuration file parsing via `agents tool add --config <file>`. Specifically: how capability metadata fields (`writes`, `read_only`, `checkpointable`, `checkpoint_scope`, `write_scope`, `side_effects`, `idempotent`, `unsafe`, `timeout`) are read from the YAML config. --- ## Expected Behavior (from spec) The spec's **Tool Configuration Files** section (§ Tool Configuration Files, JSON Schema at line ~33614, YAML examples at line ~33919) defines capability fields as **top-level properties** in the tool YAML: ```yaml name: local/run-migrations description: "Run database migrations" source: custom code: | def run(input_data): ... writes: true write_scope: "database:migrations" checkpointable: true checkpoint_scope: "transaction" side_effects: - "schema_mutation" idempotent: false timeout: 120 ``` The spec's JSON Schema (`additionalProperties: false`) lists `writes`, `read_only`, `checkpointable`, `checkpoint_scope`, `write_scope`, `side_effects`, `idempotent`, `unsafe`, `timeout` as **top-level properties** — NOT nested under a `capability:` key. --- ## Actual Behavior (from code) `Tool.from_config()` in `src/cleveragents/domain/models/core/tool.py` reads capability from a **nested `capability:` dict**: ```python # Tool.from_config() — lines 443-447 cap_data = config.get("capability") capability = ( ToolCapability.model_validate(cap_data) if cap_data else ToolCapability() ) ``` This means: 1. A user who writes a spec-compliant YAML with top-level `writes: true` will have their tool registered with `writes: false` (the default), silently ignoring their capability declaration. 2. The only way to set capability metadata is via the non-spec `capability:` nested key, which is not documented in the spec's JSON Schema or YAML examples. --- ## Steps to Reproduce Create a spec-compliant tool YAML: ```yaml name: local/test-tool description: "Test tool" source: custom code: | def run(input_data): return {"result": "ok"} writes: true checkpointable: true ``` Register it: ```bash agents tool add --config test-tool.yaml ``` Show it: ```bash agents tool show local/test-tool ``` **Expected:** `Writes: true`, `Checkpointable: true` **Actual:** `Writes: false`, `Checkpointable: false` (capability fields silently ignored) --- ## Code Location - `src/cleveragents/domain/models/core/tool.py` — `Tool.from_config()` method, lines 443–481 - `src/cleveragents/domain/models/core/tool.py` — `Validation.from_config()` method, lines 642–693 --- ## Fix Required `Tool.from_config()` must be updated to read capability fields from both the top-level config dict (spec-compliant) AND the nested `capability:` dict (backward compat). The top-level fields should take precedence when present: ```python # Read top-level capability fields (spec-compliant format) cap_data = { "writes": config.get("writes", False), "write_scope": config.get("write_scope"), "checkpointable": config.get("checkpointable", False), "checkpoint_scope": config.get("checkpoint_scope"), "side_effects": config.get("side_effects", []), "idempotent": config.get("idempotent", False), "read_only": config.get("read_only", False), "unsafe": config.get("unsafe", False), } # Also support nested capability: dict (backward compat) nested_cap = config.get("capability", {}) if nested_cap: cap_data.update(nested_cap) capability = ToolCapability(**cap_data) ``` The same fix is needed in `Validation.from_config()`. --- **Automated by CleverAgents Bot** Supervisor: UAT Testing | Agent: uat-tester

HAL9000 added the

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2026-04-09 00:51:13 +00:00

HAL9000 commented

2026-04-09 00:54:25 +00:00

Author

Owner

Issue triaged by project owner:

State: Verified
Priority: Critical — Tool YAML capability fields are silently ignored when using spec-compliant top-level format; users following the spec get wrong behavior with no error
Milestone: v3.2.0 (tool registration is core functionality)
Story Points: 3 — M — Fix requires updating Tool.from_config() to read capability fields from top-level config dict
MoSCoW: Must Have — This is a critical spec compliance bug that silently corrupts tool capability metadata; any user following the spec documentation will get incorrect behavior

This is a critical spec compliance bug. Tool.from_config() reads capability from nested capability: dict but the spec defines them as top-level properties.

Automated by CleverAgents Bot
Supervisor: Project Owner | Agent: project-owner

Issue triaged by project owner: - **State**: Verified - **Priority**: Critical — Tool YAML capability fields are silently ignored when using spec-compliant top-level format; users following the spec get wrong behavior with no error - **Milestone**: v3.2.0 (tool registration is core functionality) - **Story Points**: 3 — M — Fix requires updating `Tool.from_config()` to read capability fields from top-level config dict - **MoSCoW**: Must Have — This is a critical spec compliance bug that silently corrupts tool capability metadata; any user following the spec documentation will get incorrect behavior This is a critical spec compliance bug. `Tool.from_config()` reads capability from nested `capability:` dict but the spec defines them as top-level properties. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner

HAL9000 added the

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2026-04-09 00:54:31 +00:00

HAL9000 added this to the v3.2.0 milestone

2026-04-09 00:54:31 +00:00

HAL9000 referenced this issue

2026-04-09 00:55:21 +00:00