Copilot CLI's preToolUse output can only decide permissions, and its command
hooks fail closed on errors, so the graph context that Claude Code and Codex
searches get could not ride a pre-tool hook there. postToolUse
additionalContext is appended to the tool result the model sees on the same
turn (github/docs content/copilot/reference/hooks-reference.md). VS Code's
agent mode shares the Copilot harness and reads the same ~/.copilot/hooks
manifest.
- Manifest: $COPILOT_HOME/hooks/codebase-memory-mcp.json adds a PascalCase
PostToolUse entry, matcher "Bash|Grep|Glob|bash|powershell|grep|rg|glob",
running hook-augment --event PostToolUse --dialect copilot. The previous
lifecycle-only manifest, as installs up to v0.12 wrote it, stays recognized
as owned: install upgrades it in place and uninstall removes either
generation. A foreign manifest still fails closed.
- hook-augment: the Copilot dialect reads either payload form
(tool_name/tool_input or toolName/toolArgs), maps runtime tool names to the
Claude names (bash/powershell to Bash, grep/rg to Grep, glob to Glob),
parses arguments passed as a JSON string, and answers with top-level
additionalContext.
- Fast path: Copilot's forced PostToolUse goes through the no-op gate before
executable-identity hashing. The gate also skips tools the augmenter does
not read, because VS Code's local hook parser ignores matchers, so a
non-search shell call or an edit exits in about 20 ms instead of paying the
full round-trip of about 130 ms.
- The context header no longer says the search results are "below": after a
post-tool hook they are above it.
- Tests: the three Copilot foreign-manifest tests now create
.copilot/mcp-config.json. Without it Copilot CLI was never detected, so
install and uninstall never reached the manifest, and the tests also passed
with the ownership checks removed.
Refs #509
Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>
Martin Vogel
a18b4a4574