Merge branch 'codex/invariant-package-registration-gate' into codex/package-invariant-checks
# Conflicts: # .agents/notes/implemented/architecture/2026-07-19-package-invariant-runtime-contracts.i18n.yaml # .agents/notes/implemented/architecture/2026-07-19-package-invariant-runtime-contracts.md # .agents/notes/implemented/architecture/2026-07-19-package-invariant-runtime-contracts.zh.md # .agents/notes/implemented/architecture/2026-07-19-package-owned-invariant-service.i18n.yaml # docs/rfc/INDEX.md # packages/AGENTS.md
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@@ -70,15 +70,31 @@ Every MCP tool has two names: the raw MCP name (sent on the wire in `tools/call`
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### Discovered MCP tools
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**What the model sees**: After initial discovery succeeds, each advertised MCP tool appears as a native tool named `mcp__<serverName>__<rawName>` (or its deterministic normalized form), with the server-provided description and input schema. A successful re-sync replaces the generation; plugin disposal removes it.
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#### What the model sees
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**Token effect**: Data-dependent schema cost is paid on every request while the tools are registered. Re-sync replaces rather than accumulates schemas, and the server-qualified name adds tokens to every tool definition and call.
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After initial discovery succeeds, each advertised MCP tool appears as a native tool named `mcp__<serverName>__<rawName>` (or its deterministic normalized form), with the server-provided description and input schema. A successful re-sync replaces the generation; plugin disposal removes it.
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#### Token effect
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Data-dependent schema cost is paid on every request while the tools are registered. Re-sync replaces rather than accumulates schemas, and the server-qualified name adds tokens to every tool definition and call.
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#### KV Cache effect
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Prefix-stable while the discovered tool set and schemas are unchanged. A re-sync that adds, removes, renames, or changes a tool replaces definitions and may invalidate reuse from the first changed schema token.
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### Tool-call history and results
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**What the model sees**: The public tool name and JSON arguments remain in assistant history. Text result blocks are joined with newlines into one retained text result; image, audio, resource, and unsupported blocks become short placeholders, and MCP `isError` results follow the registry's model-visible error path.
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#### What the model sees
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**Token effect**: Arguments and mapped text are retained until compaction. Binary and resource payloads are discarded rather than added to context.
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The public tool name and JSON arguments remain in assistant history. Text result blocks are joined with newlines into one retained text result; image, audio, resource, and unsupported blocks become short placeholders, and MCP `isError` results follow the registry's model-visible error path.
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#### Token effect
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Arguments and mapped text are retained until compaction. Binary and resource payloads are discarded rather than added to context.
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#### KV Cache effect
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Append-only; newly visible content follows the reusable request prefix and does not invalidate existing KV-cache entries.
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## Known Limitations and Deferred Work
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@@ -3,7 +3,7 @@
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* under deterministic server-qualified public names, and handles re-sync when
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* the server's tool list changes.
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*
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* Naming contract (see the mcp-client RFC "Naming invariants"): every MCP tool
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* Naming contract (see the mcp-client Agent Note "Naming invariants"): every MCP tool
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* has the stable identity `(serverName, rawName)`; the model-facing public name
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* is `mcp__<serverName>__<rawName>`, normalized to the DeepSeek function-name
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* constraints. The raw name is only ever sent on the wire (`tools/call`); the
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