feat(desktop): buzz-agent MCP server configuration#1785
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Add local-only MCP server layering (global < definition < agent) for buzz-agent. Other runtimes manage their own MCP config and are unchanged. - McpServerConfig/McpServerTransport types with validate/merge/replace helpers - BUZZ_ACP_MCP_SERVERS reserved env key; desktop injects transport JSON only for buzz-agent children, explicitly removes it for all others - spawn_config_hash includes effective MCP layer so config drift triggers restart - build_deploy_payload forwards resolved Mcp transport to providers - agent_snapshot excludes mcp_servers (credentials in env vars) - GlobalAgentConfig.mcp_servers: inherits to every buzz-agent instance - AgentDefinition.mcp_servers: definition layer (not copied into record on mint) - ManagedAgentRecord.mcp_servers: per-agent override layer - buzz-acp: ConfiguredMcpServer deserialized from BUZZ_ACP_MCP_SERVERS; appended after built-in buzz-dev-mcp in build_mcp_servers - Max 15 user-defined servers (slot 16 is reserved for buzz-dev-mcp) - IPC validation at every save boundary: empty name, duplicate names, enabled with empty command, NUL bytes, per-field length cap, total payload cap, reserved env key guard Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
F1: Extend env_secrets_from_request in backend.rs to harvest mcp_servers[*].env[*].value alongside env_vars, so provider errors that echo MCP env values are redacted from desktop-visible last_error. Add two regression tests: one verifying harvest coverage, one verifying end-to-end redaction. F2: Extend validate_mcp_servers in types/mcp_servers.rs to mirror the buzz-agent name grammar (1-128 bytes, ASCII alnum/_/-, no __) and reserve the built-in buzz-dev-mcp name. Both checks fire at every IPC save boundary, so names that would fail at spawn are rejected at edit time. Add tests covering invalid chars, double-underscore, reserved name, valid grammar. F3: Restructure build_mcp_servers in buzz-acp/src/lib.rs so the built-in server push is conditional on mcp_command being non-empty, but configured_mcp_servers are always appended. Previously the early-return on empty mcp_command silently discarded user-configured servers even though they don't depend on the built-in slot. Update the test that pinned the old drop behavior; add a complementary empty-with-no-servers test. F4: Add an enabled-server count check to validate_mcp_servers: a layer with more than MAX_USER_MCP_SERVERS enabled servers is rejected at save time rather than only at merge/spawn. Add boundary tests (15 passes, 16 fails). MINOR: Add mcp_servers to the MUST NEVER list in agent_events.rs so future edits don't miss the local-only invariant. Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
New snapshot construction sites added after the original MCP change require empty local-only MCP configuration. Raise the discovery fixture-file exception by the two required fields. Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
Borrow the disabled mask for validation before moving it into the merge assertion, avoiding an unnecessary clone. Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
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…face Add buzz_agent_mcp_servers to RuntimeConfigSurface, populated by resolve_config_surface via the existing effective_buzz_agent_mcp_servers merge (global < definition < agent, enabled-only) for the buzz-agent runtime only. Every other runtime keeps the field empty and continues to surface its servers via extensions. This is the WYSIWYG read path the PR3 UI's read-only buzzAgentSlot will consume — the effective list is now reachable from the config-bridge surface the frontend already reads, matching what actually runs at spawn (spawn_hash.rs, runtime.rs) rather than just the agent's own record layer. Also bumps two pre-existing file-size overrides (agent_config.rs, readiness.rs) to their gate's own split-count, matching this diff and a prior unaccounted +1 line already on the branch. Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
Add McpServerConfig/McpServerEnvVar FE types (camelCase mirror of the Rust McpServerConfig) and mcpServers fields on ManagedAgent, AgentPersona, GlobalAgentConfig, and the create/update managed-agent and persona IPC inputs. Threads mcpServers through fromRawManagedAgent/fromRawPersona and the invoke builders in tauri.ts/tauriPersonas.ts with the same absent-vs-present contract as envVars (create sends mcpServers ?? [], update sends it only when provided). Adds the buzzAgentMcpServers surface field (populated on the backend by 859b8bb) to RuntimeConfigSurface. Wires the e2eBridge.ts mock to match: mcp_servers on the local RawManagedAgent/RawPersona types, a cloneMcpServer helper mirroring the existing clone* helpers, mcp_servers handling in the create/update persona and managed-agent mock handlers, and buzzAgentMcpServers on every buildMockConfigSurface fixture (a sample entry on the buzz-agent fixture so the read-only display has something to render by default). Bumps two file-size overrides (tauri.ts, types.ts) to the gate's own split-count for this diff. Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com> Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
…d-only panel Wires the buzzAgentSlot prop that McpServersSection has exposed since #1780 with the RuntimeConfigSurface.buzzAgentMcpServers field added in P0. AgentConfigPanel now renders the effective merged (global < definition < agent) enabled-server list via a new BuzzAgentMcpServerRow, giving Will's WYSIWYG requirement (Q2) its read-only half. Also fixes McpServersSection's fallback text, which previously rendered unreachable for buzz-agent (the extensions-based branch never executes there since buzz-agent always reports empty extensions). Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
New row-based editor for the local buzz-agent MCP server layer, modeled on EnvVarsEditor: per-server Name/Command/repeatable-Args/repeatable-Env rows plus an Enabled toggle, client-side validation mirroring the Rust validate_mcp_servers grammar (name charset, length, __, reserved name, uniqueness, command-required-when-enabled), and read-only inherited-layer rows a same-named local row overrides or masks. Command and Args are separate fields (Q1) — no combined command string, no shell-quote dependency. Not yet mounted in any dialog (P3). Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
Wires the McpServersEditor into the global config, definition, and instance-edit dialogs — completing the UI layer for the editable MCP servers feature. - GlobalAgentConfigFields: global base-layer editor (no inherited rows) - PersonaAdvancedFields: definition-layer editor with global as inherited - AgentDefinitionDialog: state, init reset, advanced-expand gate, submit - EditAgentAdvancedFields: per-instance editor with merged global+persona inherited rows; new mcpServers/inheritedMcpServers/onMcpServersChange props - AgentInstanceEditDialog: mcpServers state, inheritedMcpServers memo (mergeMcpServersByName(global, persona)), absent-preserves submit wire, and EditAgentAdvancedFields prop threading - check-file-sizes.mjs: bump AgentInstanceEditDialog override 1180→1198 (+18 lines from load-bearing P3 prop threading)
Adds invoke-layer round-trip tests + UI interaction tests for the editable MCP servers feature (P3), covering all three dialog layers. Round-trip tests (invokeTauri, behavior not impl): - persona create+update mcp_servers with add/change/drop - update_persona absent-preserves contract (omit → keeps, []→ clears) - agent create+update mcp_servers round-trip + absent-preserves UI tests with screenshots: - McpServersEditor in PersonaDialog (buzz-agent auto-expands Advanced) - McpServersEditor in global config card with pre-seeded servers - McpServersEditor in agent-instance edit dialog with pre-seeded servers Bridge changes: - MockManagedAgentSeed: add agentCommand (default "goose" preserved) and mcpServers seeding, wired into buildSeededManagedAgent - bridge.ts helper: add agentCommand/mcpServers to mock seed type; add mcp_servers to globalAgentConfig mock shape
D1 CRITICAL: default each field in get_global_agent_config bridge handler
so partial seeds don't crash McpServersEditor; add defense-in-depth
coercion at the McpServersEditor value boundary.
D2 IMPORTANT: split buzzAgentSurface into empty/populated fixtures so
test 06 ("empty MCP servers") doesn't collide with the filesystem row;
add test 06b covering populated WYSIWYG read-only display.
D3 IMPORTANT: count effective enabled servers (local + inherited not
overridden) for the cap, gating both Add button and Enabled switch;
extract effectiveEnabledCount helper with 6 unit tests.
D4 IMPORTANT: add validateMcpServerEnvEntry mirroring Rust's
validate_user_env_keys boundary (POSIX key format, reserved keys,
NUL-free values, per-value byte cap); render inline subrow errors;
12 unit tests covering all rejection paths.
D5 MINOR: replace localeCompare with ASCII byte-order comparator in
mergeMcpServersByName to match Rust BTreeMap ordering; add mixed-case
/symbol test.
…idation mirror F1: Effective-merge MCP cap check at agent create/update save time. validate_effective_mcp_cap calls effective_buzz_agent_mcp_servers (the same resolver used at spawn) and rejects when the three-layer merge (global < definition < agent) exceeds MAX_USER_MCP_SERVERS. Prevents a per-layer-valid record from silently breaking at spawn or emptying the WYSIWYG surface. Editor now shows a destructive error whenever effective count exceeds the cap (fires on rename too). 4 Rust unit tests: 15-global+1-local → Err, at-cap → Ok, rename-unmask → Err, non-buzz-agent skip. F2: Complete the client-side Rust mirror — validateMcpServerRow now checks command NUL + ≤32KB; new validateMcpServerArg checks arg NUL + ≤32KB with inline subrow errors; new validateMcpServerListPayload checks aggregate total payload ≤256KB (name+command+args+env bytes across all servers) with editor-level error. Adds MAX_ENV_TOTAL_BYTES constant. 9 unit tests: command NUL/oversize/at-limit, arg NUL/oversize /valid, payload under/over/at-limit. check-file-sizes.mjs: agent_models.rs override bumped 1079→1082 (+3 lines for the effective-cap block).
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Empty global MCP servers editorGlobal agent config MCP editor in its empty state — label, helper text, and Add server button.
Populated MCP servers editorTwo local server rows fully expanded: filesystem (npx, args, NODE_ENV env var) and sqlite-db (uvx, args). Enabled switches visible.
Inherited server rows with local overrideAgent-level editor showing an inherited global row (sqlite-db, "Inherited from global" badge with Mask button) and a local override of filesystem (bunx, "Overrides global server" hint).
Validation: reserved env key errorInline subrow error for a reserved env key —
Read-only WYSIWYG MCP servers panelAgent config profile panel for a buzz-agent showing the effective-merged "filesystem" server under the MCP Servers label with the full command line.
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Adds local-only MCP server layering for
buzz-agent. Other runtimes (Goose, Codex, Claude) manage their own MCP config and are unchanged.What ships
Three-layer merge:
global < definition < agent. Higher layers replace whole entries by name; a disabled override masks an inherited server (no leak-through).Desktop types (
mcp_servers.rs):McpServerConfig— persisted stdio server withname,command,args,env,enabledMcpServerTransport— wire shape (stripsenabled; never crosses the process/provider boundary)validate_mcp_servers— empty name, duplicate names, enabled with empty command, NUL bytes, per-field/total-payload byte caps, reserved-key guard (BUZZ_ACP_MCP_SERVERS)merge_mcp_servers— three-layerglobal/definition/agentresolve with 15-server cap (slot 16 is reserved for the bundledbuzz-dev-mcp)replace_mcp_servers— absent-preserves/present-replaces update contract, matchesenv_varssemanticsEnv injection (
runtime.rs):set_buzz_agent_mcp_servers_env— setsBUZZ_ACP_MCP_SERVERSto serialized transport JSON forbuzz-agentchildren; explicitly removes the var for all other runtimesSpawn-hash (
spawn_hash.rs):buzz-agentonly; config drift triggers auto-restartDeploy payload (
agents_deploy.rs):build_deploy_payloadresolves effective MCP transport and forwards it asmcp_servers— same path as local spawnSnapshot exclusion (
agent_snapshot.rs):mcp_serversexcluded from export snapshots (credentials in env vars)Data model (
types.rs):GlobalAgentConfig.mcp_servers— inherits to everybuzz-agentinstanceAgentDefinition.mcp_servers— definition layer (NOT copied into the record on persona→agent mint, so later persona edits aren't shadowed)ManagedAgentRecord.mcp_servers— per-agent override layerIPC (
requests.rs,agents.rs,agent_models.rs,personas/mod.rs):CreateManagedAgentRequest,UpdateManagedAgentRequest,CreatePersonaRequest,UpdatePersonaRequestall carry optional MCP fields with validation at every save boundarybuzz-acp (
config.rs,lib.rs):ConfiguredMcpServerdeserializes fromBUZZ_ACP_MCP_SERVERSbuild_mcp_serversappends desktop-resolved servers after the built-inbuzz-dev-mcpRebase compatibility
mcp_servers: vec![]discovery fixtures afterdiscovery/tests.rshad reached its existing grandfathered ceiling. The file-size override ratchets from1029to1031; this test file should be split in follow-up work.team_snapshotconstruction sites introduced after the original branch base initializemcp_serversempty, mirroring the local-onlyenv_varsbehavior. Snapshot imports therefore do not transfer MCP server definitions or their credential-bearing environment values.Tests added
Merge semantics: higher layer replaces by name, disabled mask blocks inherited server, mask needs only a name
Validation: empty name, duplicates, enabled-without-command, reserved env key, per-field/total-bytes caps
replace_mcp_serversabsent-preserves/present-replaces contractSpawn-hash: MCP edit changes buzz-agent hash; Goose ignores it; definition layer contributes without becoming an agent override
Runtime:
set_buzz_agent_mcp_servers_envsets for buzz-agent, removes for other runtimesSnapshot:
mcp_serversabsent from export JSONbuzz-acp:
parse_configured_mcp_serversround-trip;build_mcp_serversappends configured servers after builtinBorrowed the disabled-mask test value via
std::slice::from_refto satisfy clippy before the value is moved into the merge assertion.