Replace the asyncio.Semaphore queueing approach with a simple count
check in SpawnTool.execute(). When the concurrency limit is reached,
the tool returns an error string so the agent can perceive the reason
and adjust its behavior instead of silently queueing.
- Remove max_concurrent_subagents parameter threading through
AgentLoop, commands.py, and nanobot.py
- SubagentManager reads the limit directly from AgentDefaults
- SpawnTool checks get_running_count() before calling spawn()
- Simplify tests to verify rejection behavior
When the main agent spawns multiple sub-agents, each completion
independently triggered a new _dispatch, causing 3-4 user-visible
responses instead of a single comprehensive report.
- Extend _drain_pending to block-wait on pending_queue when sub-agents
are still running, keeping the runner loop alive for in-order injection
- Pass pending_queue in the system message path so subsequent sub-agent
results can still be injected mid-turn via a new dispatch
MyTool blocks direct access to sensitive nested paths, but its formatter
still printed scalar fields for small config objects. That let
`my(action="check", key="web_config.search")` expose `api_key` in plain
text even though the docs promise sensitive sub-fields are protected.
This keeps the change narrow: sensitive nested config fields are omitted
from MyTool's formatted output, and regression coverage locks the
behavior in.
Constraint: Must preserve existing read-only inspection behavior for non-sensitive fields
Constraint: Keep scope limited to MyTool rather than introducing broader redaction plumbing
Rejected: Rework global context/tool redaction around MyTool | broader than needed for the leak path
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: If more nested config rendering is added later, filter sensitive field names at the formatter boundary as well as the path resolver
Tested: PYTHONPATH=$PWD pytest -q tests/agent/tools/test_self_tool.py /Users/jh0927/Workspace/nanobot-validation-artifacts-2026-04-18/test_my_tool_secret_leak_regression.py
Not-tested: Full repository test suite
Related: #3259
Add a built-in tool that lets the agent inspect and modify its own
runtime state (model, iterations, context window, etc.).
Key features:
- inspect: view current config, usage stats, and subagent status
- modify: adjust parameters at runtime (protected by type/range validation)
- Subagent observability: inspect running subagent tasks (phase,
iteration, tool events, errors) — subagents are no longer a black box
- Watchdog corrects out-of-bounds values on each iteration
- Enabled by default in read-only mode (self_modify: false)
- All changes are in-memory only; restart restores defaults
- Comprehensive test suite (90 tests)
Includes a self-awareness skill (always-on) with progressive disclosure:
SKILL.md for core rules, references/examples.md for detailed scenarios.
