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https://github.com/NousResearch/hermes-agent.git
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dee71a31e5
The number of head messages preserved verbatim across context compactions was previously hardcoded to 3 in AIAgent.__init__. Expose it as `compression.protect_first_n` in config, matching the existing `protect_last_n` pattern. Motivation: users who rely on rolling compaction for long-running sessions had the opening user/assistant exchange pinned as head forever, which doesn't always match how they want the session framed after many compactions. Lowering to 1 preserves the system prompt + first non-system message; lowering to 0 preserves only the system prompt and lets the entire first exchange age out naturally through the summary. Semantics: `protect_first_n` counts non-system head messages protected **in addition to** the system prompt, which is always implicitly protected when present. Same meaning across both code paths: protect_first_n=0 → system prompt only (or nothing if no system message) protect_first_n=2 → system prompt + first 2 non-system messages (default) This unifies the CLI path (which reads messages with the system prompt at position 0) and the gateway path (where the gateway /compress handler strips the system prompt before calling compress() — see gateway/run.py L9150-9154 on the parent fork). Previously these two paths disagreed: CLI path: protect_first_n=1 → protect system prompt only Gateway path: protect_first_n=1 → protect first USER turn forever In practice on long-running gateway sessions the old semantics pinned whatever stale aside happened to be the first user message, reinserting it into every compaction summary indefinitely. Default chosen as 2 (not 3) so that the effective protected head count remains 3 messages in the common case — assuming a system prompt is present, default protection becomes system + 2 non-system = 3 total, matching the pre-feature behaviour where `protect_first_n` was hardcoded to protect 3 messages total. Sessions without a system prompt will see a small behaviour change (2 protected head messages instead of 3), but this is the rare path and the new semantics make the system-prompt-present case the well-defined one. Changes: - agent/context_compressor.py: redefine protect_first_n as the count of non-system head messages protected beyond the implicit system-prompt guarantee; both paths converge. Constructor default updated to 2. - hermes_cli/config.py: add `compression.protect_first_n` default (2), matching the new semantics. `show_config` label tweaked to 'Protect first: N non-system head messages' for clarity. - run_agent.py: read protect_first_n from config; 0 is now valid (system prompt is always implicitly protected). - cli-config.yaml.example: document the new key and rationale. - tests/agent/test_context_compressor.py: cover default, override, the end-to-end `protect_first_n=0` and `protect_first_n=1` behaviour, the no-system-prompt (gateway) path, and the new shared-semantics regression test. Fixes #13751 Tested on Ubuntu 24.04. |
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| .. | ||
| acp | ||
| acp_adapter | ||
| agent | ||
| cli | ||
| cron | ||
| e2e | ||
| environments/benchmarks | ||
| fakes | ||
| gateway | ||
| hermes_cli | ||
| hermes_state | ||
| honcho_plugin | ||
| integration | ||
| openviking_plugin | ||
| plugins | ||
| providers | ||
| run_agent | ||
| skills | ||
| stress | ||
| tools | ||
| tui_gateway | ||
| website | ||
| __init__.py | ||
| conftest.py | ||
| run_interrupt_test.py | ||
| test_account_usage.py | ||
| test_atomic_replace_symlinks.py | ||
| test_base_url_hostname.py | ||
| test_batch_runner_checkpoint.py | ||
| test_cli_file_drop.py | ||
| test_cli_manual_compress.py | ||
| test_cli_skin_integration.py | ||
| test_ctx_halving_fix.py | ||
| test_empty_model_fallback.py | ||
| test_evidence_store.py | ||
| test_get_tool_definitions_cache_isolation.py | ||
| test_hermes_bootstrap.py | ||
| test_hermes_constants.py | ||
| test_hermes_home_profile_warning.py | ||
| test_hermes_logging.py | ||
| test_hermes_state.py | ||
| test_hermes_state_wal_fallback.py | ||
| test_honcho_client_config.py | ||
| test_install_sh_browser_install.py | ||
| test_install_sh_pythonpath_sanitization.py | ||
| test_install_sh_setup_wizard_tty_probe.py | ||
| test_install_sh_termux_network_prereqs.py | ||
| test_ipv4_preference.py | ||
| test_lazy_session_regressions.py | ||
| test_lint_config.py | ||
| test_live_system_guard_self_test.py | ||
| test_mcp_serve.py | ||
| test_mini_swe_runner.py | ||
| test_minimax_model_validation.py | ||
| test_minimax_oauth.py | ||
| test_minisweagent_path.py | ||
| test_model_picker_scroll.py | ||
| test_model_tools.py | ||
| test_model_tools_async_bridge.py | ||
| test_ollama_num_ctx.py | ||
| test_packaging_metadata.py | ||
| test_plugin_skills.py | ||
| test_process_loop_event_loop_warning.py | ||
| test_project_metadata.py | ||
| test_retry_utils.py | ||
| test_sql_injection.py | ||
| test_subprocess_home_isolation.py | ||
| test_termux_all_extra_compat.py | ||
| test_timezone.py | ||
| test_toolset_distributions.py | ||
| test_toolsets.py | ||
| test_trajectory_compressor.py | ||
| test_trajectory_compressor_async.py | ||
| test_transform_llm_output_hook.py | ||
| test_transform_tool_result_hook.py | ||
| test_tui_gateway_server.py | ||
| test_utils_truthy_values.py | ||
| test_yuanbao_integration.py | ||
| test_yuanbao_markdown.py | ||
| test_yuanbao_pipeline.py | ||
| test_yuanbao_proto.py | ||