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UAT: ToolRegistry.find_tools_for_resource() never matches MCP tools — key name mismatch ("resource_bindings" vs "resource_slots") #4808

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opened 2026-04-08 19:32:39 +00:00 by HAL9000 · 1 comment

HAL9000 commented

2026-04-08 19:32:39 +00:00

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Bug Report

Feature Area: Tool Registry — resource binding slots / polymorphic tool matching
Severity: High — functional gap, MCP tool resource binding is silently broken
Found by: UAT tester instance uat-worker-tool-skill-system
Spec reference: docs/specification.md §Tool Interface — Resource Binding Slots; ADR-042

What Was Tested

Code-level analysis of src/cleveragents/tool/registry.py (find_tools_for_resource()) and src/cleveragents/mcp/adapter.py (register_tools()).

Expected Behavior (from spec)

ToolRegistry.find_tools_for_resource(resource_type, type_registry) is supposed to find all tools whose resource bindings accept a given resource type, implementing ADR-042 Tool Binding Polymorphism. MCP tools registered via MCPToolAdapter.register_tools() should be discoverable by resource type.

Actual Behavior

There is a key name mismatch between the two components:

MCPToolAdapter.register_tools() stores inferred resource slots under "resource_slots" in source_metadata:

# src/cleveragents/mcp/adapter.py ~line 300
spec = ToolSpec(
    ...
    source_metadata={
        "server": self._config.name,
        "resource_slots": slot_dicts,   # ← stored as "resource_slots"
        ...
    },
)

ToolRegistry.find_tools_for_resource() looks for "resource_bindings" key:

# src/cleveragents/tool/registry.py ~line 90
bindings = spec.source_metadata.get("resource_bindings", [])  # ← reads "resource_bindings"
if not bindings:
    continue

Since "resource_bindings" is never set by MCPToolAdapter, find_tools_for_resource() will always return an empty list for MCP tools, even when they have inferred resource slots.

Steps to Reproduce

from cleveragents.tool.registry import ToolRegistry
from cleveragents.mcp.adapter import MCPToolAdapter, MCPServerConfig, MCPTransport

# Set up a mock MCP adapter that returns a tool with file_path parameter
# (which should infer a "file" resource slot)
registry = ToolRegistry()
# ... register MCP tools with file_path parameter ...
results = registry.find_tools_for_resource("file", {})
# Expected: tools with file_path parameter
# Actual: [] (empty list — key mismatch)

Code Locations

src/cleveragents/tool/registry.py line ~90: spec.source_metadata.get("resource_bindings", [])
src/cleveragents/mcp/adapter.py line ~300: "resource_slots": slot_dicts

Fix

Either:

Change MCPToolAdapter.register_tools() to use "resource_bindings" key instead of "resource_slots", OR
Change ToolRegistry.find_tools_for_resource() to also check "resource_slots" key

Option 1 is preferred for consistency with the ADR-042 spec language ("resource bindings"). The "resource_slots" key in source_metadata should be renamed to "resource_bindings" to match what find_tools_for_resource() expects.

Note: There is also a related TODO comment in mcp/adapter.py acknowledging that inferred slots are not yet wired to domain Tool.resource_slots. This fix addresses the registry lookup but the domain model wiring is a separate issue.

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

## Bug Report **Feature Area:** Tool Registry — resource binding slots / polymorphic tool matching **Severity:** High — functional gap, MCP tool resource binding is silently broken **Found by:** UAT tester instance `uat-worker-tool-skill-system` **Spec reference:** `docs/specification.md` §Tool Interface — Resource Binding Slots; ADR-042 --- ### What Was Tested Code-level analysis of `src/cleveragents/tool/registry.py` (`find_tools_for_resource()`) and `src/cleveragents/mcp/adapter.py` (`register_tools()`). ### Expected Behavior (from spec) `ToolRegistry.find_tools_for_resource(resource_type, type_registry)` is supposed to find all tools whose resource bindings accept a given resource type, implementing ADR-042 Tool Binding Polymorphism. MCP tools registered via `MCPToolAdapter.register_tools()` should be discoverable by resource type. ### Actual Behavior There is a **key name mismatch** between the two components: **`MCPToolAdapter.register_tools()`** stores inferred resource slots under `"resource_slots"` in `source_metadata`: ```python # src/cleveragents/mcp/adapter.py ~line 300 spec = ToolSpec( ... source_metadata={ "server": self._config.name, "resource_slots": slot_dicts, # ← stored as "resource_slots" ... }, ) ``` **`ToolRegistry.find_tools_for_resource()`** looks for `"resource_bindings"` key: ```python # src/cleveragents/tool/registry.py ~line 90 bindings = spec.source_metadata.get("resource_bindings", []) # ← reads "resource_bindings" if not bindings: continue ``` Since `"resource_bindings"` is never set by `MCPToolAdapter`, `find_tools_for_resource()` will always return an empty list for MCP tools, even when they have inferred resource slots. ### Steps to Reproduce ```python from cleveragents.tool.registry import ToolRegistry from cleveragents.mcp.adapter import MCPToolAdapter, MCPServerConfig, MCPTransport # Set up a mock MCP adapter that returns a tool with file_path parameter # (which should infer a "file" resource slot) registry = ToolRegistry() # ... register MCP tools with file_path parameter ... results = registry.find_tools_for_resource("file", {}) # Expected: tools with file_path parameter # Actual: [] (empty list — key mismatch) ``` ### Code Locations - `src/cleveragents/tool/registry.py` line ~90: `spec.source_metadata.get("resource_bindings", [])` - `src/cleveragents/mcp/adapter.py` line ~300: `"resource_slots": slot_dicts` ### Fix Either: 1. Change `MCPToolAdapter.register_tools()` to use `"resource_bindings"` key instead of `"resource_slots"`, OR 2. Change `ToolRegistry.find_tools_for_resource()` to also check `"resource_slots"` key Option 1 is preferred for consistency with the ADR-042 spec language ("resource bindings"). The `"resource_slots"` key in `source_metadata` should be renamed to `"resource_bindings"` to match what `find_tools_for_resource()` expects. Note: There is also a related TODO comment in `mcp/adapter.py` acknowledging that inferred slots are not yet wired to domain `Tool.resource_slots`. This fix addresses the registry lookup but the domain model wiring is a separate issue. --- **Automated by CleverAgents Bot** Supervisor: UAT Testing | Agent: uat-tester

HAL9000 referenced this issue

2026-04-08 19:38:31 +00:00

[Automated] CleverAgents Build Session - 2026-04-08 #4799

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[Automated] CleverAgents Build Session - 2026-04-08 #4799

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[Automated] CleverAgents Build Session - 2026-04-08 #4799

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[Automated] CleverAgents Build Session - 2026-04-08 #4799

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HAL9000 commented

2026-04-09 03:03:18 +00:00

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Issue triaged by project owner:

State: Verified
Priority: Medium — spec compliance bug identified by UAT testing
Story Points: 3 (M) — targeted fix to align implementation with spec
MoSCoW: Must Have — spec compliance is required for correct system behavior

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

Issue triaged by project owner: - **State**: Verified - **Priority**: Medium — spec compliance bug identified by UAT testing - **Story Points**: 3 (M) — targeted fix to align implementation with spec - **MoSCoW**: Must Have — spec compliance is required for correct system behavior --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner

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2026-04-09 03:03:20 +00:00

HAL9000 added this to the v3.5.0 milestone