scv_server/config/
runtime.rs

1//! Turning configuration into what the runtime, tools, and provider take.
2
3use std::{collections::HashMap, ffi::OsString, time::Duration};
4
5use anyhow::{Context, Result};
6use scv_client::Layout;
7use scv_core::{AgentConfig as CoreAgentConfig, HistoryLimits};
8use scv_provider_openai::ProviderLimits;
9use scv_tools::{
10    AgentAdapterConfig, ToolsConfig,
11    conversation::ConversationLimits,
12    web::{SearchBackend, WebToolsConfig},
13};
14
15use super::{AgentPermissions, AgentTransport, Config, WebSearchMode, load::ensure_private_dir};
16
17impl Config {
18    pub(crate) fn core_agent(&self, system_prompt: String) -> CoreAgentConfig {
19        CoreAgentConfig {
20            system_prompt,
21            max_steps: self.agent.max_steps,
22            history_limits: HistoryLimits {
23                max_bytes: self.session.max_history_bytes,
24                max_messages: self.session.max_messages,
25                note_max_chars: self.context.summary_max_chars,
26            },
27        }
28    }
29
30    pub(crate) fn tools(&self) -> ToolsConfig {
31        ToolsConfig {
32            command_timeout: Duration::from_secs(self.tools.command_timeout_seconds),
33            agent_timeout: Duration::from_secs(self.tools.agent_timeout_seconds),
34            max_timeout: Duration::from_secs(self.tools.max_timeout_seconds),
35            output_limit_bytes: self.tools.output_limit_bytes,
36            max_read_bytes: self.tools.max_read_bytes,
37            max_write_bytes: self.tools.max_write_bytes,
38            max_delegation_depth: self.agent.max_delegation_depth,
39            prefer: self.agent.prefer.clone(),
40            conversations: ConversationLimits {
41                max: self.agent.max_conversations,
42                idle: Duration::from_secs(self.agent.conversation_idle_seconds),
43            },
44            delegation: None,
45            max_background: self.agent.max_background,
46            background: None,
47            chat_attach: None,
48            chat_history: None,
49        }
50    }
51
52    /// How long a chat may be quiet before its next message starts a new
53    /// episode of its log.
54    pub(crate) fn episode_gap(&self) -> Duration {
55        Duration::from_secs(self.history.episode_gap_minutes.saturating_mul(60))
56    }
57
58    /// Where files the owner keeps from chat go: `history.archive_dir`, or
59    /// the history directory.
60    pub(crate) fn archive_dir(&self) -> std::path::PathBuf {
61        self.history
62            .archive_dir
63            .clone()
64            .unwrap_or_else(|| self.layout().history())
65    }
66
67    /// Web tool settings for a tool-enabled session, or `None` when disabled.
68    /// A Brave backend without a key is left out rather than failing the session.
69    pub(crate) fn web_tools(&self) -> Option<WebToolsConfig> {
70        if !self.web.enabled {
71            return None;
72        }
73        let search = match self.web.search {
74            WebSearchMode::Off | WebSearchMode::Provider => None,
75            WebSearchMode::Searxng => self
76                .web
77                .searxng_url
78                .clone()
79                .map(|url| SearchBackend::Searxng { url }),
80            WebSearchMode::Brave => {
81                let api_key = self
82                    .web
83                    .brave_api_key
84                    .clone()
85                    .or_else(|| {
86                        self.web
87                            .brave_api_key_env
88                            .as_deref()
89                            .and_then(|name| std::env::var(name).ok())
90                            .map(scv_client::Secret::from)
91                    })
92                    .filter(|key| !key.trim().is_empty());
93                if api_key.is_none() {
94                    tracing::warn!(
95                        "web.search is \"brave\" but no Brave API key is configured; web_search is unavailable"
96                    );
97                }
98                api_key.map(|api_key| SearchBackend::Brave {
99                    url: self.web.brave_url.clone(),
100                    api_key: api_key.into_inner(),
101                })
102            }
103        };
104        Some(WebToolsConfig {
105            fetch_max_bytes: self.web.fetch_max_bytes,
106            fetch_timeout: Duration::from_secs(self.web.fetch_timeout_seconds),
107            max_redirects: self.web.max_redirects,
108            auto_approve_domains: self.web.auto_approve_domains.clone(),
109            allow_private_addresses: self.web.allow_private_addresses,
110            search,
111            max_search_results: self.web.max_search_results,
112            output_limit: self.tools.output_limit_bytes,
113        })
114    }
115
116    /// Whether to offer the provider's hosted web search to tool-enabled sessions.
117    pub fn hosted_web_search(&self) -> bool {
118        self.web.enabled && self.web.search == WebSearchMode::Provider
119    }
120
121    pub(crate) fn provider_limits(&self) -> ProviderLimits {
122        ProviderLimits {
123            max_sse_event_bytes: self.provider_limits.max_sse_event_bytes,
124            max_response_bytes: self.provider_limits.max_response_bytes,
125            max_assistant_bytes: self.provider_limits.max_assistant_bytes,
126            max_tool_calls: self.provider_limits.max_tool_calls,
127            max_tool_arguments_bytes: self.provider_limits.max_tool_arguments_bytes,
128            max_retries: self.provider_limits.max_retries,
129            ..ProviderLimits::default()
130        }
131    }
132
133    pub fn adapters(&self) -> HashMap<String, AgentAdapterConfig> {
134        let user_home = dirs::home_dir();
135        self.agents
136            .0
137            .iter()
138            .filter_map(|(name, config)| {
139                let descriptor = scv_tools::adapters::adapter(name)?;
140                let adapter_home = self.layout().agent_home(name);
141                let mut environment = vec![
142                    (OsString::from("SCV_HOME"), adapter_home.clone().into()),
143                    (OsString::from("HOME"), adapter_home.clone().into()),
144                    (
145                        OsString::from("XDG_CONFIG_HOME"),
146                        adapter_home.join("config").into(),
147                    ),
148                    (
149                        OsString::from("XDG_DATA_HOME"),
150                        adapter_home.join("data").into(),
151                    ),
152                    (
153                        OsString::from("XDG_STATE_HOME"),
154                        adapter_home.join("state").into(),
155                    ),
156                ];
157                for (variable, relative) in descriptor.home_environment {
158                    let path = if relative.is_empty() {
159                        adapter_home.clone()
160                    } else {
161                        adapter_home.join(relative)
162                    };
163                    environment.push((OsString::from(variable), path.into()));
164                }
165                let full = config.permissions == AgentPermissions::Full;
166                environment.extend(
167                    descriptor
168                        .fixed_environment
169                        .iter()
170                        .chain(
171                            descriptor
172                                .full_permission_environment
173                                .iter()
174                                .filter(|_| full),
175                        )
176                        .map(|(variable, value)| (OsString::from(variable), OsString::from(value))),
177                );
178                Some((
179                    name.clone(),
180                    AgentAdapterConfig {
181                        command: config.command.clone(),
182                        args: config.args.clone(),
183                        prompt_args: config.prompt_args.clone(),
184                        full_permission_args: full.then(|| {
185                            descriptor
186                                .full_permission_args
187                                .iter()
188                                .map(|arg| (*arg).to_owned())
189                                .collect()
190                        }),
191                        model_args: config.model_args.clone(),
192                        effort_args: config.effort_args.clone(),
193                        model_hint: descriptor.model_hint.into(),
194                        environment,
195                        search_dirs: user_home
196                            .as_deref()
197                            .map(|home| scv_tools::adapters::adapter_search_dirs(descriptor, home))
198                            .unwrap_or_default(),
199                        output: descriptor.output,
200                        resume: descriptor.resume,
201                        home: Some(adapter_home),
202                        transport: descriptor.transport,
203                        acp: descriptor
204                            .acp
205                            .filter(|_| match config.transport {
206                                AgentTransport::Acp => true,
207                                AgentTransport::Resume => false,
208                                // A custom `command` points SCV at a specific
209                                // CLI, which the ACP server would not run.
210                                AgentTransport::Auto => config.command == descriptor.command,
211                            })
212                            .map(|launch| scv_tools::AcpAgentLaunch {
213                                command: launch.command.to_owned(),
214                                args: scv_tools::adapters::acp_args(&launch, full),
215                                full_mode: launch.full_mode.filter(|_| full).map(str::to_owned),
216                                environment: launch
217                                    .full_environment
218                                    .iter()
219                                    .filter(|_| full)
220                                    .map(|(variable, value)| {
221                                        (OsString::from(variable), OsString::from(value))
222                                    })
223                                    .collect(),
224                                required: config.transport == AgentTransport::Acp,
225                            }),
226                        use_for: config.use_for.clone(),
227                        model: config.model.clone(),
228                        effort: config.effort.clone(),
229                    },
230                ))
231            })
232            .collect()
233    }
234
235    /// The paths under this instance's home. It does not know whether the
236    /// instance is the default one, so take the service unit name from the
237    /// `Layout` the process resolved instead.
238    pub fn layout(&self) -> Layout {
239        Layout::new(&self.instance_home)
240    }
241
242    pub fn prepare_adapter_homes(&self) -> Result<()> {
243        let layout = self.layout();
244        std::fs::create_dir_all(layout.agents()).context("create the agent homes directory")?;
245        ensure_private_dir(&layout.agents())?;
246        for name in self.agents.0.keys() {
247            let path = layout.agent_home(name);
248            std::fs::create_dir_all(&path)
249                .with_context(|| format!("create isolated {name} agent home"))?;
250            ensure_private_dir(&path)
251                .with_context(|| format!("secure isolated {name} agent home"))?;
252        }
253        Ok(())
254    }
255}
scv_server/config/runtime.rs

scv_server/config/
runtime.rs
