Fixing leaky or imitable compression/truncation markers
Cluster 121548 · agent. Data as of
1 open item. Fix merged in #124207 on 26 Sep 2026. Check it covers your case.
The short answer
- Known?
- Yes. 4 related items grouped here, 1 issue already closed.
- Fix event
- A fix was merged to main in PR #124207. Check it covers your case. No release data is tracked.
- Tracker
- The maintainers' tracker marks this
resolved, deciding PR #124207. That is separate from the fix event. - Still open
- 0 issues and 1 PR.
These items address multiple sites in the agent codebase that compose or copy a bare, imitable truncation marker rather than routing through a guarded, non-imitable compression marker. The work spans at least five identified locations and includes preventing copied placeholders from corrupting new writes.
Open issues0
Open PRs1
- PR#121579fix(agent): stop copied compression placeholders from corrupting new writes
Fixes on record
-
#124207 fix(agent): route every model-visible elision through the guarded compression marker
files:
agent/compression_marker.py,agent/context_compressor.py,agent/context_engine.py,agent/lsp/reporter.py,agent/skill_preprocessing.py,agent/verification_stop.py,plugins/platforms/slack/adapter.py,tests/agent/lsp/test_reporter.py,tests/agent/test_compression_marker.py,tests/agent/test_context_compressor.py,tests/agent/test_pre_compress_memory_context_handoff.py,tests/gateway/test_slack_unfurl_nested_blocks_budget.py,tests/test_trajectory_compressor.py,trajectory_compressor.py
1 PR closed without merging
From the close comments: done elsewhere 1
-
#121608 fix(agent): route every model-visible elision through the non-imitable compression marker · done elsewhere →
d6031d2,#124207
Closed issues · 1
- Closed#121548[Bug]: #83714 fix covered only the args renderer — 5 sites still compose the imitable bare '...[truncated]' marker
How this cluster was grouped
-
Link evidence (
structural links throughout): every member is connected by structural evidence: shared changed files, or a closing/superseded reference. -
Pairwise link density
0.50: the share of item pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36.1.00means every pair is linked.
Pick up a Lab task
Check whether a fix covers the open issues here, with your own agent. Bring back evidence for maintainers.
Open the LabAt a glance
- Subsystem
- agent
- Merged PRs
- #124207
- Closed issues
- 1
- Attempts
- 1 PR closed without merging
- Fix link checked
- 26 Sep 2026