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fix(context-window): Tighten context limits and bound memory excerpts (#67277)

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* Tighten context limits and bound memory excerpts

* Align startup context defaults in config docs

* Align qmd memory_get bounds with shared limits

* Preserve qmd partial memory reads

* Fix shared memory read type import

* Add changelog entry for context bounds
This commit is contained in:
Tak Hoffman
2026-04-15 13:06:02 -05:00
committed by GitHub
parent 89d2c145df
commit 4f00b76925
57 changed files with 1628 additions and 155 deletions
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19
docs/reference/token-use.md
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@@ -16,9 +16,12 @@ OpenAI-style models average ~4 characters per token for English text.
OpenClaw assembles its own system prompt on every run. It includes:
- Tool list + short descriptions
- Skills list (only metadata; instructions are loaded on demand with `read`)
- Skills list (only metadata; instructions are loaded on demand with `read`).
The compact skills block is bounded by `skills.limits.maxSkillsPromptChars`,
with optional per-agent override at
`agents.list[].skillsLimits.maxSkillsPromptChars`.
- Self-update instructions
- Workspace + bootstrap files (`AGENTS.md`, `SOUL.md`, `TOOLS.md`, `IDENTITY.md`, `USER.md`, `HEARTBEAT.md`, `BOOTSTRAP.md` when new, plus `MEMORY.md` when present or `memory.md` as a lowercase fallback). Large files are truncated by `agents.defaults.bootstrapMaxChars` (default: 20000), and total bootstrap injection is capped by `agents.defaults.bootstrapTotalMaxChars` (default: 150000). `memory/*.md` daily files are not part of the normal bootstrap prompt; they remain on-demand via memory tools on ordinary turns, but bare `/new` and `/reset` can prepend a one-shot startup-context block with recent daily memory for that first turn. That startup prelude is controlled by `agents.defaults.startupContext`.
- Workspace + bootstrap files (`AGENTS.md`, `SOUL.md`, `TOOLS.md`, `IDENTITY.md`, `USER.md`, `HEARTBEAT.md`, `BOOTSTRAP.md` when new, plus `MEMORY.md` when present or `memory.md` as a lowercase fallback). Large files are truncated by `agents.defaults.bootstrapMaxChars` (default: 12000), and total bootstrap injection is capped by `agents.defaults.bootstrapTotalMaxChars` (default: 60000). `memory/*.md` daily files are not part of the normal bootstrap prompt; they remain on-demand via memory tools on ordinary turns, but bare `/new` and `/reset` can prepend a one-shot startup-context block with recent daily memory for that first turn. That startup prelude is controlled by `agents.defaults.startupContext`.
- Time (UTC + user timezone)
- Reply tags + heartbeat behavior
- Runtime metadata (host/OS/model/thinking)
@@ -36,6 +39,18 @@ Everything the model receives counts toward the context limit:
- Compaction summaries and pruning artifacts
- Provider wrappers or safety headers (not visible, but still counted)
Some runtime-heavy surfaces have their own explicit caps:
- `agents.defaults.contextLimits.memoryGetMaxChars`
- `agents.defaults.contextLimits.memoryGetDefaultLines`
- `agents.defaults.contextLimits.toolResultMaxChars`
- `agents.defaults.contextLimits.postCompactionMaxChars`
Per-agent overrides live under `agents.list[].contextLimits`. These knobs are
for bounded runtime excerpts and injected runtime-owned blocks. They are
separate from bootstrap limits, startup-context limits, and skills prompt
limits.
For images, OpenClaw downscales transcript/tool image payloads before provider calls.
Use `agents.defaults.imageMaxDimensionPx` (default: `1200`) to tune this: