fix(skills): filter platform-disabled skills from prompt (#46201)

[Tranquil-Flow]

Summary

Fixes #46201.

Disabled skills were still leaking into <available_skills> for active platforms because prompt construction did not pass the resolved platform into get_disabled_skill_names(). A second related bug meant platform-specific disables replaced the global skills.disabled set instead of merging with it.

This PR:

• threads the resolved platform hint into build_skills_system_prompt() disabled-skill filtering
• merges global and platform-specific disabled skill sets in get_disabled_skill_names()
• adds prompt-builder regression coverage for platform-disabled skills and global+platform merge behavior
• updates skill-config tests to assert the intended merged semantics

Verification

Ran focused regression suite with the shared Hermes Python 3.11 venv:

/Users/evinova-self/.hermes/hermes-agent/venv/bin/python3 -m pytest \
  tests/hermes_cli/test_skills_config.py \
  tests/agent/test_prompt_builder.py \
  -v -o "addopts=" --tb=short

Result: 164 passed, 1 skipped in 0.29s.

Competitor analysis

An existing PR, #46203, addresses the same issue and has green CI, but it includes unrelated desktop/shared TypeScript config changes, line-ending churn in tests/hermes_cli/test_skills_config.py, and weakens an existing prompt-builder test by removing an assertion. This PR keeps the fix focused to the Python prompt/skills paths and targeted tests only.

Auto-published by Moonsong via Path B automated pipeline.

[liuhao1024]

Reviewed the diff — LGTM. Clean fix with good test coverage.

Details:

• The core change in get_disabled_skill_names() correctly unions global + platform disabled sets instead of replacing one with the other. This fixes the regression where platform_disabled.telegram: [xurl] would silently un-hide globally disabled skills on Telegram sessions.
• prompt_builder.py passes _platform_hint through so the disabled check actually sees the active platform.
• Test coverage: test_excludes_platform_disabled_skills and test_global_disabled_merged_with_platform_disabled directly validate the regression path from [Bug]: Disabled skills still appear in <available_skills> prompt and trigger false loads #46201.
• Existing assertions in test_skills_config.py updated to reflect merged behavior.

Note: #46203 (iborazzi) applies the same core fix but without the dedicated test coverage and with an unrelated tsconfig.json change. This PR is the stronger candidate.

[alt-glitch]

Duplicate of #46236 (merged) — that PR fixes #46201 by unifying all disabled-skill resolution sites. Competes with #46203.

[teknium1]

Thanks for the focused fix. This is an automated hermes-sweeper review; the reported behavior is already implemented on current main through merged PR #46236, which the member comment identified.

• agent/prompt_builder.py:1480 now passes the resolved platform to get_disabled_skill_names().
• agent/skill_utils.py:385-392 unions global and per-platform disabled skill sets.
• Commit 7bbe7024c207a6dad982967780995ad18ac7e7be contains the matching core implementation and is an ancestor of current main.
• Merged follow-up ce19fdb7ce27d94462a650ade8a2b94882590a38 additionally fixes the corresponding configuration UI and skill_view resolution sites, making fix(skills): platform-disabled skills still appear in <available_skills> + unify all resolution sites (#46201) #46236 the more complete fix.
• The implementation shipped in v2026.6.19.